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intech-cow/leetcode (press backspace or delete to remove)116 | Populating Next Right Pointers in Each Node
BFS Solution
class Solution(object):
def connect(self, root):
if not root:
return
queue = [root]
while queue: ...
tech-cow
- Opened on Mar 19, 2020
- #99
98 Validate BST * 7 https://leetcode.com/problems/validate-binary-search-tree 977 Squares of a Sorted Array *2
https://leetcode.com/problems/squares-of-a-sorted-array 140 Word Break II * 2
https://leetcode.com/problems/word-break-ii ...
- Opened on Feb 27, 2020
- #98
Week 2 | Day 6
Goal
DFS / Backtracking
Leetcode
- [x] 301 Remove Invalid Parentheses
- [x] 78. Subsets
- [x] 567. Permutation in String
- [x] 79. Word Search
- Could Trie improves Speed? ...
- 2
- Opened on Feb 24, 2020
- #97
- 2
- Opened on Feb 24, 2020
- #96
560. Subarray Sum Equals K
不懂的可以参考: https://leetcode-cn.com/problems/subarray-sum-equals-k/solution/hot-100-he-wei-kde-zi-shu-zu-python3-cong-bao-li-j/
[1:29] Start
Thought Process
1. [Brute Force] ...
- 1
- Opened on Feb 24, 2020
- #95
Goal
- Focus on High Freq Qs
- [x] 560. Subarray Sum Equals K
- [x] 301. Remove Invalid Parentheses
- [x] 20. Valid Parentheses
- [x] 921. Minimum Add to Make Parentheses Valid
- [x] 1249. ...
- 6
- Opened on Feb 21, 2020
- #94
Week 2 | Day 1
Goal
- Focus on High Freq Qs
560. Subarray Sum Equals K (x7)
- [ ] 560. Subarray Sum Equals K Variation Non-negative # using sliding window.
301. Remove Invalid Parentheses (X8) ...
- 6
- Opened on Feb 18, 2020
- #93
Leetcode
- [ ] 65. Valid Number
- [x] 314 Binary Tree Vertical Order Traversal | O(N) Time
- [ ] 304 Range Sum Query 2D - Immutable | What about Mutable?
- [ ] 438 Find All Anagrams in a String ...
- Opened on Feb 12, 2020
- #91
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