Add solutions and explanations for problems 3606, 2807, 1769, 239, 2161, 2181, 2044, 1038, 2433, 2125, 2657, 2265, 1828 #116
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…61, 2181, 2044, 1038, 2433, 2125, 2657, 2265, 1828
Reviewer's GuideAdds Python solutions and structured explanations for 13 LeetCode problems, standardizing them into the repository’s Solution class pattern and adding walkthrough-style English writeups; also refactors the existing 3606 explanation to a shorter, strategy-focused format and wraps its solution in a Solution class with minor implementation reshaping. Class diagram for new and updated Solution classes in this PRclassDiagram
class ListNode {
+val: int
+next: ListNode
}
class TreeNode {
+val: int
+left: TreeNode
+right: TreeNode
}
class Solution3606 {
+validateCoupons(code: List[str], businessLine: List[str], isActive: List[bool]) List[str]
}
class Solution2807 {
+insertGreatestCommonDivisors(head: ListNode) ListNode
-gcd(a: int, b: int) int
}
class Solution1769 {
+minOperations(boxes: str) List[int]
}
class Solution239 {
+maxSlidingWindow(nums: List[int], k: int) List[int]
}
class Solution2161 {
+pivotArray(nums: List[int], pivot: int) List[int]
}
class Solution2181 {
+mergeNodes(head: ListNode) ListNode
}
class Solution2044 {
+countMaxOrSubsets(nums: List[int]) int
}
class Solution1038 {
+bstToGst(root: TreeNode) TreeNode
-reverse_inorder(node: TreeNode) void
}
class Solution2433 {
+findArray(pref: List[int]) List[int]
}
class Solution2125 {
+numberOfBeams(bank: List[str]) int
}
class Solution2657 {
+findThePrefixCommonArray(A: List[int], B: List[int]) List[int]
}
class Solution2265 {
+averageOfSubtree(root: TreeNode) int
-dfs(node: TreeNode) tuple[int, int]
}
class Solution1828 {
+countPoints(points: List[List[int]], queries: List[List[int]]) List[int]
}
Solution2807 --> ListNode
Solution2181 --> ListNode
Solution1038 --> TreeNode
Solution2265 --> TreeNode
File-Level Changes
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WalkthroughAdds many new explanation Markdown files and corresponding Python solution implementations for multiple problems; reformats two existing explanations and makes small updates to two solution files (2807 and 3606). Changes are documentation and algorithmic solution additions with minor solution refactors. Changes
Estimated code review effort🎯 3 (Moderate) | ⏱️ ~25 minutes
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Hey there - I've reviewed your changes - here's some feedback:
- In
solutions/1769/01.pythe double nested loop leads to O(n²) time; you can reduce this to O(n) by doing two linear passes that maintain running counts of balls and moves from the left and right, then summing the contributions for each position. - In
solutions/3606/01.py, consider avoiding reusing the namecodein the final list comprehension (return [code for _, code in res]) to prevent shadowing the input list parameter and improve readability.
Prompt for AI Agents
Please address the comments from this code review:
## Overall Comments
- In `solutions/1769/01.py` the double nested loop leads to O(n²) time; you can reduce this to O(n) by doing two linear passes that maintain running counts of balls and moves from the left and right, then summing the contributions for each position.
- In `solutions/3606/01.py`, consider avoiding reusing the name `code` in the final list comprehension (`return [code for _, code in res]`) to prevent shadowing the input list parameter and improve readability.Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
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Actionable comments posted: 17
🧹 Nitpick comments (7)
solutions/2125/01.py (1)
1-18: Logic is correct; matches the intended “adjacent non-empty rows” rule.
Optional refactor: compute in one pass withprev = 0and accumulateprev*countwhencount>0to avoiddevice_counts.solutions/2657/01.py (1)
1-19: Correct, but can be O(n) instead of repeated set intersections.
Consider tracking counts in one dict/array and incrementingcommononly when an element has been seen in both prefixes (avoidsseen_a & seen_beach loop).solutions/1038/01.py (1)
1-26: Consider adding type stub forTreeNodeto support local linting, but not required for LeetCode submission.The repo's ruff configuration enables F821 (undefined name detection), and
TreeNodeis used in type hints without being defined or imported. However, CI does not enforce Python linting, so this is not a blocking issue. The pattern of using undefinedTreeNodeis consistent across all solution files and is intentional—these files are designed for LeetCode submission whereTreeNodeis provided at runtime.If you want to enable local linting without breaking LeetCode compatibility, add a TYPE_CHECKING stub:
+from __future__ import annotations +from typing import Optional, TYPE_CHECKING + # Definition for a binary tree node. # class TreeNode: # def __init__(self, val=0, left=None, right=None): # self.val = val # self.left = left # self.right = right + +if TYPE_CHECKING: + class TreeNode: + val: int + left: Optional["TreeNode"] + right: Optional["TreeNode"] + class Solution: def bstToGst(self, root: TreeNode) -> TreeNode:The algorithm logic is correct (reverse in-order traversal with accumulation).
explanations/2125/en.md (1)
19-21: Brute-force complexity is stated as O(m² * n²); consider rephrasing to avoid an inaccurate bound.“Check every device pair” is more naturally expressed in terms of number of devices
D(e.g., O(D²) to consider all pairs), rather than grid dimensions.explanations/2807/en.md (1)
17-21: Brute force vs optimized: both bullets describe Euclidean GCD; consider collapsing to one concise note.solutions/3606/01.py (1)
30-31: Variable shadowing:codeshadows input parameter.The list comprehension uses
codeas a loop variable, which shadows thecodeinput parameter. While functionally correct here since the input isn't used afterward, this reduces readability and could cause confusion during maintenance.# Return only the codes - return [code for _, code in res] + return [c for _, c in res]explanations/3606/en.md (1)
35-35: Use Python boolean syntax for consistency.The example uses JavaScript-style
trueinstead of Python'sTrue. Since the solution is in Python, using the correct syntax helps readers follow along.- - `isActive = [true, true, true, true]` + - `isActive = [True, True, True, True]`
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📒 Files selected for processing (26)
explanations/1038/en.md(1 hunks)explanations/1769/en.md(1 hunks)explanations/1828/en.md(1 hunks)explanations/2044/en.md(1 hunks)explanations/2125/en.md(1 hunks)explanations/2161/en.md(1 hunks)explanations/2181/en.md(1 hunks)explanations/2265/en.md(1 hunks)explanations/239/en.md(1 hunks)explanations/2433/en.md(1 hunks)explanations/2657/en.md(1 hunks)explanations/2807/en.md(1 hunks)explanations/3606/en.md(1 hunks)solutions/1038/01.py(1 hunks)solutions/1769/01.py(1 hunks)solutions/1828/01.py(1 hunks)solutions/2044/01.py(1 hunks)solutions/2125/01.py(1 hunks)solutions/2161/01.py(1 hunks)solutions/2181/01.py(1 hunks)solutions/2265/01.py(1 hunks)solutions/239/01.py(1 hunks)solutions/2433/01.py(1 hunks)solutions/2657/01.py(1 hunks)solutions/2807/01.py(2 hunks)solutions/3606/01.py(1 hunks)
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🧬 Code graph analysis (1)
solutions/2181/01.py (2)
solutions/2807/01.py (1)
Solution(8-31)solutions/2/01.js (2)
current(8-8)dummy(7-7)
🪛 LanguageTool
explanations/2125/en.md
[style] ~27-~27: ‘Sum Total’ might be wordy. Consider a shorter alternative.
Context: ...ws, multiply their device counts. 4. Sum Total: Add up all beam counts. ### Steps ...
(EN_WORDINESS_PREMIUM_SUM_TOTAL)
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🪛 Ruff (0.14.8)
solutions/1038/01.py
8-8: Undefined name TreeNode
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solutions/2807/01.py
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solutions/2265/01.py
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solutions/2181/01.py
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⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (1)
- GitHub Check: Sourcery review
🔇 Additional comments (13)
solutions/2161/01.py (1)
3-20: LGTM! Clean three-way partition implementation.The solution correctly partitions the array into three groups (less than, equal to, greater than pivot) and concatenates them in the proper order. The implementation is straightforward and efficient.
solutions/1769/01.py (1)
3-16: LGTM! Correct brute force implementation.The solution correctly calculates the minimum operations for each position by summing distances to all '1' positions. The O(n²) approach matches the documented strategy and passes all test cases.
solutions/2433/01.py (1)
3-16: LGTM! Excellent use of XOR properties.The solution correctly recovers the original array using the XOR identity. The inline comments provide clear mathematical reasoning for the approach, making the code easy to understand.
explanations/2265/en.md (1)
1-54: LGTM! Clear and comprehensive explanation.The documentation provides a thorough walkthrough of the DFS approach with complexity analysis, step-by-step decomposition, and a detailed trace table. The explanation effectively illustrates how to compute subtree averages.
explanations/2433/en.md (1)
1-52: LGTM! Well-structured explanation with verification steps.The documentation clearly explains the XOR recovery approach with a comprehensive trace table that includes verification steps. This helps readers confirm the correctness of each calculated value.
solutions/2044/01.py (1)
3-23: LGTM! Correct subset enumeration approach.The solution correctly computes the maximum bitwise OR and then enumerates all non-empty subsets using bitmasks to count those achieving the maximum. The implementation is clear and accurate.
solutions/2807/01.py (2)
6-7: LGTM! Proper import added.The
Optionalimport correctly supports the type hint in the function signature.
15-29: LGTM! Correct GCD insertion logic.The implementation correctly:
- Computes the GCD of adjacent node values
- Inserts a new node with the GCD value between them
- Advances to the node after the insertion to continue traversal
The static analysis warning about
ListNodebeing undefined is a false positive—LeetCode provides this class definition in the runtime environment.explanations/239/en.md (1)
1-56: LGTM! Excellent explanation of the deque approach.The documentation provides a comprehensive walkthrough of the sliding window maximum problem using a monotonic deque. The detailed trace table with window state and actions makes the algorithm easy to follow.
solutions/239/01.py (1)
1-26: Deque-based sliding window max is correct and idiomatic.
Optional:for i, x in enumerate(nums):can avoid repeated indexing, but current version is fine.solutions/1828/01.py (1)
1-24: Squared-distance implementation is correct and clear.
Optional:for px, py in points:andx, y, r = queryis already good; overall LGTM.solutions/3606/01.py (1)
3-28: LGTM! Clean implementation of the coupon validator.The filtering logic correctly handles all three validation conditions (active status, code format, valid business line), and the tuple-based sorting elegantly achieves the required ordering by priority then lexicographically by code.
explanations/3606/en.md (1)
1-56: Well-structured explanation with clear walkthrough.The explanation effectively breaks down the problem with constraints, approach comparison, decomposition steps, and a trace table that makes the algorithm easy to follow.
| **Constraints & Edge Cases** | ||
|
|
||
| * **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100. | ||
| * **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder. | ||
| * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n. | ||
| * **Edge Case:** A tree with a single node returns itself with the same value. | ||
|
|
||
| **High-level approach** | ||
| We perform a reverse inorder traversal (right, root, left) of the BST. This visits nodes in descending order. As we traverse, we accumulate the sum of all values we've seen and update each node's value to be the sum of itself and all greater values. | ||
|
|
||
| ![BST with reverse inorder traversal showing cumulative sum updates] | ||
|
|
||
| **Brute force vs. optimized strategy** | ||
|
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||
| * **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space. | ||
| * **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place. | ||
|
|
||
| **Decomposition** |
There was a problem hiding this comment.
Fix markdownlint violations (MD036/MD007) and the placeholder “image” line.
Bold text is being used as headings, list indentation is off, and ![...] without (url) isn’t an image.
-**Constraints & Edge Cases**
+#### Constraints & Edge Cases
- * **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100.
- * **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder.
- * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n.
- * **Edge Case:** A tree with a single node returns itself with the same value.
+* **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100.
+* **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder.
+* **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n.
+* **Edge Case:** A tree with a single node returns itself with the same value.
-**High-level approach**
+#### High-level approach
We perform a reverse inorder traversal (right, root, left) of the BST. This visits nodes in descending order. As we traverse, we accumulate the sum of all values we've seen and update each node's value to be the sum of itself and all greater values.
-
-![BST with reverse inorder traversal showing cumulative sum updates]
+_Diagram: reverse inorder traversal showing cumulative sum updates_
-**Brute force vs. optimized strategy**
+#### Brute force vs. optimized strategy
- * **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space.
- * **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place.
+* **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space.
+* **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place.
-**Decomposition**
+#### Decomposition📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| **Constraints & Edge Cases** | |
| * **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100. | |
| * **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder. | |
| * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n. | |
| * **Edge Case:** A tree with a single node returns itself with the same value. | |
| **High-level approach** | |
| We perform a reverse inorder traversal (right, root, left) of the BST. This visits nodes in descending order. As we traverse, we accumulate the sum of all values we've seen and update each node's value to be the sum of itself and all greater values. | |
| ![BST with reverse inorder traversal showing cumulative sum updates] | |
| **Brute force vs. optimized strategy** | |
| * **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space. | |
| * **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place. | |
| **Decomposition** | |
| #### Constraints & Edge Cases | |
| * **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100. | |
| * **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder. | |
| * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n. | |
| * **Edge Case:** A tree with a single node returns itself with the same value. | |
| #### High-level approach | |
| We perform a reverse inorder traversal (right, root, left) of the BST. This visits nodes in descending order. As we traverse, we accumulate the sum of all values we've seen and update each node's value to be the sum of itself and all greater values. | |
| _Diagram: reverse inorder traversal showing cumulative sum updates_ | |
| #### Brute force vs. optimized strategy | |
| * **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space. | |
| * **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place. | |
| #### Decomposition |
🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
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🤖 Prompt for AI Agents
In explanations/1038/en.md around lines 5 to 22, several markdownlint issues:
bold text is used as headings, list indentation is inconsistent (MD007) and
there is an image placeholder using ![...] without a URL (MD036). Replace bold
heading lines with proper Markdown headings (e.g., start with ## or ### as
appropriate), normalize list indentation to a consistent style (use consistent
marker and indentation for nested lists, e.g., two-space indents or one-level
lists with no extra leading spaces), and either provide a valid image markdown
with an actual URL/relative path and meaningful alt text or remove the
placeholder line entirely.
| **Constraints & Edge Cases** | ||
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| * **Input Size:** The length of boxes string `n` is between 1 and 2000. | ||
| * **Time Complexity:** O(n²) - For each of n positions, we iterate through all n boxes to calculate operations. | ||
| * **Space Complexity:** O(n) - We create a result array of size n. | ||
| * **Edge Case:** If all boxes are empty (all '0'), all positions require 0 operations. | ||
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| **High-level approach** | ||
| For each target position, we calculate the total number of operations needed to move all balls from their current positions to that target. Each ball requires `abs(target_position - current_position)` operations to move. | ||
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| ![Visualization showing balls moving from their positions to a target box] | ||
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| **Brute force vs. optimized strategy** | ||
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| * **Brute Force:** For each position, iterate through all boxes and sum the distances. This is O(n²) which is acceptable for n ≤ 2000. | ||
| * **Optimized Strategy:** We could use prefix sums to optimize, but for the given constraints, the brute force approach is straightforward and efficient enough. | ||
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| **Decomposition** |
There was a problem hiding this comment.
Fix markdownlint violations (MD036/MD007) and the placeholder image line.
Convert bold “section titles” to headings, unindent list bullets, and replace ![...] (no URL) with valid markdown (real link) or plain text.
🤖 Prompt for AI Agents
In explanations/1769/en.md around lines 5 to 22, the markdown has lint
violations: bold section titles should be real headings, list bullets are
over-indented, and there is a placeholder image (![...]) with no URL. Convert
the bolded “Constraints & Edge Cases” and “High-level approach” (and any other
bold section titles in this range) to proper markdown headings (e.g., starting
with ##), unindent the list bullets to the top-level list indentation, and
replace the placeholder image line with either a valid image link or a short
plain-text sentence describing the visualization (e.g., "Visualization: balls
moving towards a target box") so the file passes MD036/MD007.
| **Constraints & Edge Cases** | ||
|
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||
| * **Input Size:** Points array has up to 500 points, and queries array has up to 500 queries. | ||
| * **Time Complexity:** O(q * p) - For each query, we check all points, where q is the number of queries and p is the number of points. | ||
| * **Space Complexity:** O(q) - We create a result array of size q. | ||
| * **Edge Case:** If a circle has radius 0, only points exactly at the center are inside. | ||
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|
There was a problem hiding this comment.
Resolve markdownlint (MD036/MD007) by converting bold “section titles” into headings + fixing bullet indentation.
Also applies to: 17-22
🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
🤖 Prompt for AI Agents
In explanations/1828/en.md around lines 5 to 11 (and also apply the same change
to lines 17 to 22), convert the bolded pseudo-section titles (e.g.,
"**Constraints & Edge Cases**") into proper Markdown headings (e.g., "###
Constraints & Edge Cases") and fix bullet list indentation so sub-bullets align
under their parent list item with a consistent number of spaces (use two spaces
for nested bullets or one level of indentation), ensuring list items start with
a single asterisk or dash and there are blank lines before and after the heading
to satisfy markdownlint MD036/MD007.
| * **Input Size:** The number of nodes is in the range `[1, 5000]`, and node values are between 1 and 1000. | ||
| * **Time Complexity:** O(n * log(max_val)) - We iterate through n-1 pairs of adjacent nodes, and calculating GCD takes O(log(max_val)) time where max_val is the maximum node value. | ||
| * **Space Complexity:** O(1) - We only use a constant amount of extra space (excluding the output list which is required). | ||
| * **Edge Case:** A list with only one node requires no insertions. |
There was a problem hiding this comment.
Space complexity wording: there isn’t really an “output list” here; it’s in-place insertion.
Suggest: “Space Complexity: O(1) extra space” (or clarify you mean “auxiliary space” excluding newly created nodes).
🤖 Prompt for AI Agents
In explanations/2807/en.md around lines 7 to 10, the Space Complexity line
incorrectly refers to an "output list" even though nodes are inserted in-place;
update the wording to clarify auxiliary space usage by changing it to something
like "Space Complexity: O(1) extra space (auxiliary space, excluding newly
created nodes during in-place insertion)" or simply "Space Complexity: O(1)
extra space" so it accurately reflects in-place insertions.
| from typing import Optional | ||
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| class Solution: | ||
| def mergeNodes(self, head: Optional[ListNode]) -> Optional[ListNode]: | ||
| # Skip the first zero | ||
| current = head.next | ||
| dummy = ListNode(0) | ||
| tail = dummy |
There was a problem hiding this comment.
Ruff F821 (ListNode) + potential None deref on head.next.
Even if LeetCode guarantees a non-empty list starting with 0, this repo’s lint/runtime may not. Also, head.next will crash if head is None.
+from __future__ import annotations
from typing import Optional
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+ class ListNode: ...
class Solution:
- def mergeNodes(self, head: Optional[ListNode]) -> Optional[ListNode]:
+ def mergeNodes(self, head: Optional["ListNode"]) -> Optional["ListNode"]:
+ if not head or not head.next:
+ return None
# Skip the first zero
current = head.next
- dummy = ListNode(0)
+ dummy = ListNode(0)
tail = dummyAlso, unless you’re intentionally handling consecutive zeros, the if total > 0: guard is likely unnecessary given problem constraints (segments are non-empty).
Also applies to: 15-31
🧰 Tools
🪛 Ruff (0.14.8)
9-9: Undefined name ListNode
(F821)
9-9: Undefined name ListNode
(F821)
12-12: Undefined name ListNode
(F821)
🤖 Prompt for AI Agents
In solutions/2181/01.py around lines 6 to 13, the code uses an undefined
ListNode name and dereferences head.next without guarding against head being
None; update the signature to use a forward reference Optional['ListNode'] (so
the linter won’t flag F821) and add an early check returning None if head is
None before accessing head.next; set current = head.next only after that check,
and remove the unnecessary if total > 0 guard inside the merge loop per problem
constraints so you always append the accumulated sum when a zero delimiter is
reached.
| class Solution: | ||
| def averageOfSubtree(self, root: TreeNode) -> int: | ||
| res = 0 | ||
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||
| def dfs(node): | ||
| nonlocal res | ||
| if not node: | ||
| return 0, 0 # sum, count | ||
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| # Get subtree info from children | ||
| left_sum, left_count = dfs(node.left) | ||
| right_sum, right_count = dfs(node.right) | ||
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| # Calculate current subtree sum and count | ||
| subtree_sum = node.val + left_sum + right_sum | ||
| subtree_count = 1 + left_count + right_count | ||
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| # Calculate average (integer division) | ||
| avg = subtree_sum // subtree_count | ||
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| # Check if node value equals average | ||
| if node.val == avg: | ||
| res += 1 | ||
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| return subtree_sum, subtree_count | ||
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| dfs(root) | ||
| return res | ||
|
|
There was a problem hiding this comment.
Ruff F821: TreeNode is undefined—use forward references or a TYPE_CHECKING import to keep lint green.
If this repo runs Ruff outside LeetCode’s runtime, the annotation will fail. One minimal fix is to use string annotations + a TYPE_CHECKING import.
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+ from typing import Optional, Tuple
+ class TreeNode: ...
+
class Solution:
- def averageOfSubtree(self, root: TreeNode) -> int:
+ def averageOfSubtree(self, root: "TreeNode") -> int:
res = 0
- def dfs(node):
+ def dfs(node: "TreeNode"):
nonlocal res
if not node:
return 0, 0 # sum, count(Adapt the TreeNode import/stub to whatever shared definitions this repo uses.)
📝 Committable suggestion
‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.
| class Solution: | |
| def averageOfSubtree(self, root: TreeNode) -> int: | |
| res = 0 | |
| def dfs(node): | |
| nonlocal res | |
| if not node: | |
| return 0, 0 # sum, count | |
| # Get subtree info from children | |
| left_sum, left_count = dfs(node.left) | |
| right_sum, right_count = dfs(node.right) | |
| # Calculate current subtree sum and count | |
| subtree_sum = node.val + left_sum + right_sum | |
| subtree_count = 1 + left_count + right_count | |
| # Calculate average (integer division) | |
| avg = subtree_sum // subtree_count | |
| # Check if node value equals average | |
| if node.val == avg: | |
| res += 1 | |
| return subtree_sum, subtree_count | |
| dfs(root) | |
| return res | |
| from __future__ import annotations | |
| from typing import TYPE_CHECKING | |
| if TYPE_CHECKING: | |
| from typing import Optional, Tuple | |
| class TreeNode: ... | |
| class Solution: | |
| def averageOfSubtree(self, root: "TreeNode") -> int: | |
| res = 0 | |
| def dfs(node: "TreeNode"): | |
| nonlocal res | |
| if not node: | |
| return 0, 0 # sum, count | |
| # Get subtree info from children | |
| left_sum, left_count = dfs(node.left) | |
| right_sum, right_count = dfs(node.right) | |
| # Calculate current subtree sum and count | |
| subtree_sum = node.val + left_sum + right_sum | |
| subtree_count = 1 + left_count + right_count | |
| # Calculate average (integer division) | |
| avg = subtree_sum // subtree_count | |
| # Check if node value equals average | |
| if node.val == avg: | |
| res += 1 | |
| return subtree_sum, subtree_count | |
| dfs(root) | |
| return res |
🧰 Tools
🪛 Ruff (0.14.8)
8-8: Undefined name TreeNode
(F821)
🤖 Prompt for AI Agents
In solutions/2265/01.py around lines 7 to 35, the type annotation references
TreeNode which is undefined for static linters; update annotations to use a
forward reference and guard any real import with TYPE_CHECKING. Concretely,
change the signature to use a string annotation for TreeNode (e.g., "TreeNode"),
add from typing import TYPE_CHECKING and under if TYPE_CHECKING: import or
import the TreeNode stub from your shared defs so runtime doesn't require the
name, and ensure any other references in the file use the same forward-reference
pattern.
…image placeholders from explanations
There was a problem hiding this comment.
Actionable comments posted: 3
♻️ Duplicate comments (11)
explanations/1828/en.md (2)
5-20: Resolve MD036/MD007 (headings + bullet indentation).Same issue as previously noted: convert bold pseudo-headings to real headings and unindent bullets so markdownlint passes (also apply to the later “Brute force…” / “Decomposition” sections).
12-18: Check for / remove the invalid image placeholder (![alt]without URL).explanations/2125/en.md (2)
5-20: Fix MD036/MD007 (headings + bullet indentation).
12-18: Check for / remove the invalid image placeholder (![alt]without URL).explanations/1769/en.md (1)
5-22: Fix MD036/MD007 and remove/replace any placeholder image line.explanations/2657/en.md (2)
5-22: Fix MD036/MD007 (headings + bullet indentation).
12-18: Check for / remove the invalid image placeholder (![alt]without URL).explanations/2181/en.md (1)
5-22: Fix MD036/MD007 and remove/replace any placeholder image line.explanations/2807/en.md (1)
9-9: Clarify space complexity wording: distinguish auxiliary space from newly created nodes.The phrase "excluding the output list which is required" is misleading in the context of in-place insertion. Revise to: "O(1) extra space (auxiliary space; newly created GCD nodes are part of the output structure)."
- * **Space Complexity:** O(1) - We only use a constant amount of extra space (excluding the output list which is required). + * **Space Complexity:** O(1) extra space – We use only constant auxiliary space; newly created GCD nodes are part of the output structure and not counted as extra space.explanations/2161/en.md (1)
5-20: Fix unresolved markdownlint violations: replace bold with headings and normalize list indentation.These MD036 (emphasis as heading) and MD007 (list indentation) issues were flagged in the previous review and remain unresolved. Use proper Markdown headings (
####) instead of bold, and normalize list indentation to 0 spaces.-**Constraints & Edge Cases** +#### Constraints & Edge Cases - * **Input Size:** Array length can be up to 10⁵, and values can range from -10⁶ to 10⁶. - * **Time Complexity:** O(n) - We make a single pass through the array to partition elements. - * **Space Complexity:** O(n) - We create three lists to store elements (less, equal, greater). - * **Edge Case:** All elements equal to pivot results in returning the original array. +* **Input Size:** Array length can be up to 10⁵, and values can range from -10⁶ to 10⁶. +* **Time Complexity:** O(n) - We make a single pass through the array to partition elements. +* **Space Complexity:** O(n) - We create three lists to store elements (less, equal, greater). +* **Edge Case:** All elements equal to pivot results in returning the original array. -**High-level approach** +#### High-level approach We partition the array into three groups: elements less than pivot, elements equal to pivot, and elements greater than pivot. We maintain the relative order within each group, then combine them. -**Brute force vs. optimized strategy** +#### Brute force vs. optimized strategy - * **Brute Force:** Sort the array - but this doesn't maintain relative order of elements within groups. - * **Optimized Strategy:** Use three separate lists to collect elements in a single pass, preserving relative order. +* **Brute Force:** Sort the array - but this doesn't maintain relative order of elements within groups. +* **Optimized Strategy:** Use three separate lists to collect elements in a single pass, preserving relative order. -**Decomposition** +#### Decompositionexplanations/1038/en.md (1)
5-20: Fix unresolved markdownlint violations: replace bold with headings and normalize list indentation.These MD036 (emphasis as heading) and MD007 (list indentation) issues were flagged in the previous review as major and remain unresolved. Use proper Markdown headings (
####) instead of bold, and normalize list indentation to 0 spaces.-**Constraints & Edge Cases** +#### Constraints & Edge Cases - * **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100. - * **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder. - * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n. - * **Edge Case:** A tree with a single node returns itself with the same value. +* **Input Size:** The number of nodes is in the range `[1, 100]`, and node values are between 0 and 100. +* **Time Complexity:** O(n) - We traverse each node exactly once in reverse inorder. +* **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n. +* **Edge Case:** A tree with a single node returns itself with the same value. -**High-level approach** +#### High-level approach We perform a reverse inorder traversal (right, root, left) of the BST. This visits nodes in descending order. As we traverse, we accumulate the sum of all values we've seen and update each node's value to be the sum of itself and all greater values. -**Brute force vs. optimized strategy** +#### Brute force vs. optimized strategy - * **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space. - * **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place. +* **Brute Force:** Collect all values, sort them, and update nodes - but this requires extra space. +* **Optimized Strategy:** Use reverse inorder traversal to visit nodes in descending order naturally, updating values in-place. -**Decomposition** +#### Decomposition
🧹 Nitpick comments (1)
explanations/2125/en.md (1)
22-26: Optional: shorten “Sum Total” to “Sum” / “Accumulate”.
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro
📒 Files selected for processing (14)
explanations/1038/en.md(1 hunks)explanations/1769/en.md(1 hunks)explanations/1828/en.md(1 hunks)explanations/2044/en.md(1 hunks)explanations/2125/en.md(1 hunks)explanations/2161/en.md(1 hunks)explanations/2181/en.md(1 hunks)explanations/2265/en.md(1 hunks)explanations/239/en.md(1 hunks)explanations/2433/en.md(1 hunks)explanations/2657/en.md(1 hunks)explanations/2807/en.md(1 hunks)explanations/3606/en.md(1 hunks)solutions/2627/01.py(1 hunks)
🚧 Files skipped from review as they are similar to previous changes (2)
- explanations/239/en.md
- explanations/2044/en.md
🧰 Additional context used
🪛 LanguageTool
explanations/2125/en.md
[style] ~25-~25: ‘Sum Total’ might be wordy. Consider a shorter alternative.
Context: ...ws, multiply their device counts. 4. Sum Total: Add up all beam counts. ### Steps ...
(EN_WORDINESS_PREMIUM_SUM_TOTAL)
🪛 markdownlint-cli2 (0.18.1)
explanations/3606/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/2125/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/2265/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/2657/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/1038/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/1769/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/1828/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/2161/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/2181/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
explanations/2433/en.md
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
15-15: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
17-17: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
18-18: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
20-20: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
⏰ Context from checks skipped due to timeout of 90000ms. You can increase the timeout in your CodeRabbit configuration to a maximum of 15 minutes (900000ms). (2)
- GitHub Check: Sourcery review
- GitHub Check: Cursor Bugbot
🔇 Additional comments (2)
explanations/3606/en.md (1)
1-54: Verify the previously-reported broken image placeholder is actually gone.A prior review flagged an invalid Markdown image (
![alt text]with no(url)), but it’s not present in the snippet shown here. Please double-check the full file still doesn’t contain such a line (or fix it if it does).solutions/2627/01.py (1)
1-2:thisbinding lost in debounce; also consider moving JS to separate fileLine 21 calls
fn(...args), but LeetCode 2627 expects the debounced function to preserve thethiscontext of its caller. Usefn.apply(this, args)instead:- timeoutId = setTimeout(() => { - fn(...args); - }, t); + timeoutId = setTimeout(() => { + fn.apply(this, args); + }, t);Additionally, the repository pattern (e.g.,
solutions/1/01.jsas a standalone file) suggests JavaScript solutions should live in separate.jsfiles rather than embedded in.pydocstrings. Either move this tosolutions/2627/01.jsor replace01.pywith a small Python placeholder that clearly opts out of Python.Likely an incorrect or invalid review comment.
| **Constraints & Edge Cases** | ||
|
|
||
| * **Input Size:** The number of nodes is in the range `[1, 1000]`, and node values are between 0 and 1000. | ||
| * **Time Complexity:** O(n) - We traverse each node exactly once in a DFS traversal. | ||
| * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n. | ||
| * **Edge Case:** A tree with a single node always satisfies the condition (node value equals its own average). |
There was a problem hiding this comment.
Fix markdownlint MD036/MD007 (headings + bullet indentation).
-**Constraints & Edge Cases**
-
- * **Input Size:** The number of nodes is in the range `[1, 1000]`, and node values are between 0 and 1000.
- * **Time Complexity:** O(n) - We traverse each node exactly once in a DFS traversal.
- * **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n.
- * **Edge Case:** A tree with a single node always satisfies the condition (node value equals its own average).
+#### Constraints & Edge Cases
+
+* **Input Size:** The number of nodes is in the range `[1, 1000]`, and node values are between 0 and 1000.
+* **Time Complexity:** O(n) - We traverse each node exactly once in a DFS traversal.
+* **Space Complexity:** O(h) - The recursion stack uses space proportional to the height of the tree, where h is at most n.
+* **Edge Case:** A tree with a single node always satisfies the condition (node value equals its own average).
@@
-**Brute force vs. optimized strategy**
+#### Brute force vs. optimized strategy
@@
- * **Brute Force:** For each node, separately calculate subtree sum and count - but this would cause redundant calculations.
- * **Optimized Strategy:** Use DFS to calculate sum and count in a single pass, reusing calculations from child subtrees.
+* **Brute Force:** For each node, separately calculate subtree sum and count - but this would cause redundant calculations.
+* **Optimized Strategy:** Use DFS to calculate sum and count in a single pass, reusing calculations from child subtrees.
@@
-**Decomposition**
+#### DecompositionAlso applies to: 15-20
🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
🤖 Prompt for AI Agents
In explanations/2265/en.md around lines 5 to 10 (and similarly apply the same
fixes to lines 15 to 20), the markdown has heading/bullet formatting issues
triggering markdownlint MD036/MD007; adjust the markdown so headings are
separated from the subsequent list by a blank line and ensure list items are
consistently indented (use one space after the bullet and align nested list
levels), rewrite the block as: add a blank line after the "**Constraints & Edge
Cases**" heading, normalize bullets to use a single asterisk or hyphen with a
single space, and ensure any nested bullet paragraphs are indented with two
spaces for each level so markdownlint rules pass.
| **Constraints & Edge Cases** | ||
|
|
||
| * **Input Size:** Array length is between 1 and 10⁵, and values are between 0 and 10⁶. | ||
| * **Time Complexity:** O(n) - We make a single pass through the array. | ||
| * **Space Complexity:** O(n) - We create a result array of size n. | ||
| * **Edge Case:** When the array has only one element, `res[0] = pref[0]`. |
There was a problem hiding this comment.
Fix markdownlint MD036/MD007 (headings + bullet indentation).
-**Constraints & Edge Cases**
-
- * **Input Size:** Array length is between 1 and 10⁵, and values are between 0 and 10⁶.
- * **Time Complexity:** O(n) - We make a single pass through the array.
- * **Space Complexity:** O(n) - We create a result array of size n.
- * **Edge Case:** When the array has only one element, `res[0] = pref[0]`.
+#### Constraints & Edge Cases
+
+* **Input Size:** Array length is between 1 and 10⁵, and values are between 0 and 10⁶.
+* **Time Complexity:** O(n) - We make a single pass through the array.
+* **Space Complexity:** O(n) - We create a result array of size n.
+* **Edge Case:** When the array has only one element, `res[0] = pref[0]`.
@@
-**Brute force vs. optimized strategy**
+#### Brute force vs. optimized strategy
@@
- * **Brute Force:** Try all possible values for each position - this is exponential and inefficient.
- * **Optimized Strategy:** Use the XOR property: if `a ^ b = c`, then `a = c ^ b`. This allows us to recover each value in O(1) time.
+* **Brute Force:** Try all possible values for each position - this is exponential and inefficient.
+* **Optimized Strategy:** Use the XOR property: if `a ^ b = c`, then `a = c ^ b`. This allows us to recover each value in O(1) time.
@@
-**Decomposition**
+#### DecompositionAlso applies to: 15-20
🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
🤖 Prompt for AI Agents
In explanations/2433/en.md around lines 5 to 10, the section uses bold text as a
heading and has inconsistent bullet indentation which triggers markdownlint
MD036/MD007; replace the bold line with a proper ATX heading (e.g., "##
Constraints & Edge Cases") with a single blank line above it, then make the
unordered list items start at column 0 (no leading spaces) and keep consistent
indentation for any nested bullets (use two spaces per level); apply the same
fixes to the same pattern on lines 15-20.
| **Constraints & Edge Cases** | ||
|
|
||
| Explanation: | ||
| - First coupon is valid. | ||
| - Second coupon has empty code (invalid). | ||
| - Third coupon is valid. | ||
| - Fourth coupon has special character @ (invalid). | ||
| * **Input Size:** We have three arrays of length `n` where `1 <= n <= 100`. The arrays are small enough that we can use simple iteration. | ||
| * **Time Complexity:** O(n log n) - We iterate through all coupons once (O(n)) and then sort them (O(n log n)). The sorting dominates the complexity. | ||
| * **Space Complexity:** O(n) - We store valid coupons in a list for sorting. | ||
| * **Edge Case:** Empty code strings or codes with special characters must be filtered out. |
There was a problem hiding this comment.
Fix markdownlint MD036/MD007 by using headings + unindented bullets.
-**Constraints & Edge Cases**
-
- * **Input Size:** We have three arrays of length `n` where `1 <= n <= 100`. The arrays are small enough that we can use simple iteration.
- * **Time Complexity:** O(n log n) - We iterate through all coupons once (O(n)) and then sort them (O(n log n)). The sorting dominates the complexity.
- * **Space Complexity:** O(n) - We store valid coupons in a list for sorting.
- * **Edge Case:** Empty code strings or codes with special characters must be filtered out.
+#### Constraints & Edge Cases
+
+* **Input Size:** We have three arrays of length `n` where `1 <= n <= 100`. The arrays are small enough that we can use simple iteration.
+* **Time Complexity:** O(n log n) - We iterate through all coupons once (O(n)) and then sort them (O(n log n)). The sorting dominates the complexity.
+* **Space Complexity:** O(n) - We store valid coupons in a list for sorting.
+* **Edge Case:** Empty code strings or codes with special characters must be filtered out.
@@
-**Brute force vs. optimized strategy**
+#### Brute force vs. optimized strategy
@@
- * **Brute Force:** Check each coupon individually and sort the entire result set at the end. This is what we're doing, and it's efficient for the given constraints.
- * **Optimized Strategy:** Same approach - filter valid coupons and sort. The optimization comes from using a priority map for efficient business line ordering.
+* **Brute Force:** Check each coupon individually and sort the entire result set at the end. This is what we're doing, and it's efficient for the given constraints.
+* **Optimized Strategy:** Same approach - filter valid coupons and sort. The optimization comes from using a priority map for efficient business line ordering.
@@
-**Decomposition**
+#### DecompositionAlso applies to: 15-18, 20-25
🧰 Tools
🪛 markdownlint-cli2 (0.18.1)
5-5: Emphasis used instead of a heading
(MD036, no-emphasis-as-heading)
7-7: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
8-8: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
9-9: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
10-10: Unordered list indentation
Expected: 0; Actual: 2
(MD007, ul-indent)
romankurnovskii
deleted the
problems-3606-2627-2807-1769-239-2161-2181-2044-1038-2433-2125-2657-2265-1828
branch
2 participants
Summary
This PR adds solutions and explanations for 13 LeetCode problems. All solutions have been submitted and accepted on LeetCode.
Note: Problem 2627 (Debounce) is JavaScript-only and was skipped as this repository focuses on Python solutions.
Problems Added
Problem 3606: Coupon Code Validator (Easy)
Problem 2807: Insert Greatest Common Divisors in Linked List (Medium)
Problem 1769: Minimum Number of Operations to Move All Balls to Each Box (Medium)
Problem 239: Sliding Window Maximum (Hard)
Problem 2161: Partition Array According to Given Pivot (Medium)
Problem 2181: Merge Nodes in Between Zeros (Medium)
Problem 2044: Count Number of Maximum Bitwise-OR Subsets (Medium)
Problem 1038: Binary Search Tree to Greater Sum Tree (Medium)
Problem 2433: Find The Original Array of Prefix Xor (Medium)
Problem 2125: Number of Laser Beams in a Bank (Medium)
Problem 2657: Find the Prefix Common Array of Two Arrays (Medium)
Problem 2265: Count Nodes Equal to Average of Subtree (Medium)
Problem 1828: Queries on Number of Points Inside a Circle (Medium)
Files Changed
solutions/<problem-number>/01.pyexplanations/<problem-number>/en.mdAll explanations follow the structured format defined in the repository guidelines.
Summary by Sourcery
Add Python solutions and accompanying explanations for a set of LeetCode problems and align existing implementations with the repository’s Solution-class pattern.
New Features:
Enhancements:
Documentation:
Summary by CodeRabbit
New Features
Refactor
Docs
✏️ Tip: You can customize this high-level summary in your review settings.
Note
Add Python solutions and structured explanations for 13 LeetCode problems, refactor 2807/3606 to Solution class format, and include JS-only implementation for 2627.
1038,1769,1828,2044,2125,2161,2181,2265,239,2433,2657,2807,3606undersolutions/*/01.py.1038), brute-force distance sums (1769), point-in-circle checks (1828), bitmask subset OR counting (2044), row device counts and products (2125), three-way partition (2161), merge segments between zeros (2181), DFS subtree sums/counts (2265), monotonic deque (239), XOR diff recovery (2433), prefix-common sets (2657), in-place GCD node insertion (2807), coupon filter+priority sort (3606).2807and3606to standardSolutionclass API; replace2627with JS-only solution snippet and remove prior Python wrapper.explanations/*/en.md, aligning to repository format (constraints, approach, steps).Written by Cursor Bugbot for commit f5d4664. This will update automatically on new commits. Configure here.