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🚀 LeetCode Mastery — One Problem at a Time!

A curated collection of LeetCode problems to help you ace your coding interviews, one problem at a time.

Created using LeetHub v2 🚀


🧠 Topics Covered

🧱 Stacks & Queues

Sharpen your skills with essential data structures:

🛠️ Design & Implementation

Think like a system designer:

🧮 Arrays & Math

Get comfortable with core algorithms:

🌲 Trees, DFS & BFS

Master tree traversals and recursion:

🔍 Graph & Union Find

Tackle connectivity and networks:

📅 Greedy, Heap & Sorting

Optimise your solutions smartly:

🔠 Strings, Prefix Sum & DP

Improve your problem-solving toolkit:


Keep solving, keep growing!

Pro Tip: Fork this repo, pick a topic, and challenge yourself daily! 🚀

LeetCode Topics

Array

0001-two-sum
0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0048-rotate-image
0051-n-queens
0053-maximum-subarray
0073-set-matrix-zeroes
0075-sort-colors
0078-subsets
0079-word-search
0090-subsets-ii
0121-best-time-to-buy-and-sell-stock
0136-single-number
0162-find-peak-element
0216-combination-sum-iii
0268-missing-number
0322-coin-change
0410-split-array-largest-sum
0485-max-consecutive-ones
0496-next-greater-element-i
0503-next-greater-element-ii
0540-single-element-in-a-sorted-array
0560-subarray-sum-equals-k
0792-binary-search
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays
1878-check-if-array-is-sorted-and-rotated
1951-find-the-winner-of-the-circular-game
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers
3741-reschedule-meetings-for-maximum-free-time-ii
3799-unique-3-digit-even-numbers

Greedy

0410-split-array-largest-sum
2032-largest-odd-number-in-string
2497-maximum-matching-of-players-with-trainers
3741-reschedule-meetings-for-maximum-free-time-ii

Enumeration

3741-reschedule-meetings-for-maximum-free-time-ii
3799-unique-3-digit-even-numbers

Hash Table

0001-two-sum
0003-longest-substring-without-repeating-characters
0017-letter-combinations-of-a-phone-number
0037-sudoku-solver
0073-set-matrix-zeroes
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0160-intersection-of-two-linked-lists
0205-isomorphic-strings
0242-valid-anagram
0268-missing-number
0496-next-greater-element-i
0560-subarray-sum-equals-k
0966-binary-subarrays-with-sum
1370-count-number-of-nice-subarrays
2479-meeting-rooms-iii
3799-unique-3-digit-even-numbers

Sorting

0075-sort-colors
0148-sort-list
0242-valid-anagram
0268-missing-number
2479-meeting-rooms-iii
2497-maximum-matching-of-players-with-trainers

Heap (Priority Queue)

2479-meeting-rooms-iii

Simulation

0258-add-digits
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2479-meeting-rooms-iii

Dynamic Programming

0022-generate-parentheses
0053-maximum-subarray
0070-climbing-stairs
0121-best-time-to-buy-and-sell-stock
0124-binary-tree-maximum-path-sum
0131-palindrome-partitioning
0322-coin-change
0410-split-array-largest-sum
1013-fibonacci-number
2028-the-earliest-and-latest-rounds-where-players-compete

Memoization

0070-climbing-stairs
1013-fibonacci-number
2028-the-earliest-and-latest-rounds-where-players-compete

Two Pointers

0019-remove-nth-node-from-end-of-list
0061-rotate-list
0075-sort-colors
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0151-reverse-words-in-a-string
0160-intersection-of-two-linked-lists
0234-palindrome-linked-list
0344-reverse-string
0908-middle-of-the-linked-list
2216-delete-the-middle-node-of-a-linked-list
2497-maximum-matching-of-players-with-trainers

Linked List

0002-add-two-numbers
0019-remove-nth-node-from-end-of-list
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0061-rotate-list
0138-copy-list-with-random-pointer
0141-linked-list-cycle
0142-linked-list-cycle-ii
0148-sort-list
0160-intersection-of-two-linked-lists
0206-reverse-linked-list
0234-palindrome-linked-list
0237-delete-node-in-a-linked-list
0328-odd-even-linked-list
0908-middle-of-the-linked-list
1411-convert-binary-number-in-a-linked-list-to-integer
2216-delete-the-middle-node-of-a-linked-list

Math

0002-add-two-numbers
0048-rotate-image
0050-powx-n
0070-climbing-stairs
0231-power-of-two
0258-add-digits
0268-missing-number
0282-expression-add-operators
0326-power-of-three
0342-power-of-four
0795-k-th-symbol-in-grammar
1013-fibonacci-number
1370-count-number-of-nice-subarrays
1411-convert-binary-number-in-a-linked-list-to-integer
1444-number-of-steps-to-reduce-a-number-to-zero
1951-find-the-winner-of-the-circular-game
2032-largest-odd-number-in-string
2050-count-good-numbers

Bit Manipulation

0078-subsets
0090-subsets-ii
0136-single-number
0231-power-of-two
0268-missing-number
0342-power-of-four
0795-k-th-symbol-in-grammar
1444-number-of-steps-to-reduce-a-number-to-zero

Binary Search

0033-search-in-rotated-sorted-array
0034-find-first-and-last-position-of-element-in-sorted-array
0035-search-insert-position
0162-find-peak-element
0268-missing-number
0410-split-array-largest-sum
0540-single-element-in-a-sorted-array
0792-binary-search
1046-max-consecutive-ones-iii

String

0003-longest-substring-without-repeating-characters
0008-string-to-integer-atoi
0017-letter-combinations-of-a-phone-number
0020-valid-parentheses
0022-generate-parentheses
0079-word-search
0131-palindrome-partitioning
0151-reverse-words-in-a-string
0205-isomorphic-strings
0242-valid-anagram
0282-expression-add-operators
0344-reverse-string
0812-rotate-string
1667-find-kth-bit-in-nth-binary-string
2032-largest-odd-number-in-string

Recursion

0002-add-two-numbers
0021-merge-two-sorted-lists
0025-reverse-nodes-in-k-group
0050-powx-n
0206-reverse-linked-list
0231-power-of-two
0234-palindrome-linked-list
0326-power-of-three
0342-power-of-four
0795-k-th-symbol-in-grammar
1013-fibonacci-number
1667-find-kth-bit-in-nth-binary-string
1951-find-the-winner-of-the-circular-game
2050-count-good-numbers
3799-unique-3-digit-even-numbers

Queue

0225-implement-stack-using-queues
0232-implement-queue-using-stacks
1951-find-the-winner-of-the-circular-game

Backtracking

0017-letter-combinations-of-a-phone-number
0022-generate-parentheses
0037-sudoku-solver
0039-combination-sum
0040-combination-sum-ii
0046-permutations
0051-n-queens
0078-subsets
0079-word-search
0090-subsets-ii
0131-palindrome-partitioning
0216-combination-sum-iii
0282-expression-add-operators

Depth-First Search

0079-word-search
0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0235-lowest-common-ancestor-of-a-binary-search-tree

Matrix

0037-sudoku-solver
0048-rotate-image
0073-set-matrix-zeroes
0079-word-search

Stack

0020-valid-parentheses
0094-binary-tree-inorder-traversal
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks
0234-palindrome-linked-list
0496-next-greater-element-i
0503-next-greater-element-ii

Divide and Conquer

0053-maximum-subarray
0148-sort-list

Merge Sort

0148-sort-list

Design

0155-min-stack
0225-implement-stack-using-queues
0232-implement-queue-using-stacks

Tree

0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

Binary Tree

0094-binary-tree-inorder-traversal
0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0110-balanced-binary-tree
0124-binary-tree-maximum-path-sum
0144-binary-tree-preorder-traversal
0145-binary-tree-postorder-traversal
0199-binary-tree-right-side-view
0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

Breadth-First Search

0100-same-tree
0101-symmetric-tree
0102-binary-tree-level-order-traversal
0104-maximum-depth-of-binary-tree
0199-binary-tree-right-side-view
0322-coin-change

Number Theory

0258-add-digits

Monotonic Stack

0496-next-greater-element-i
0503-next-greater-element-ii

Prefix Sum

0410-split-array-largest-sum
0560-subarray-sum-equals-k
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays

Binary Search Tree

0235-lowest-common-ancestor-of-a-binary-search-tree
0450-delete-node-in-a-bst
0783-search-in-a-binary-search-tree
0784-insert-into-a-binary-search-tree

String Matching

0812-rotate-string

Sliding Window

0003-longest-substring-without-repeating-characters
0966-binary-subarrays-with-sum
1046-max-consecutive-ones-iii
1370-count-number-of-nice-subarrays

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A collection of LeetCode questions to ace the coding interview! - Created using [LeetHub v2](https://github.com/arunbhardwaj/LeetHub-2.0)

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