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[LeetCode] 1001. Grid Illumination

2

You are given a `grid` of size `N x N`, and each cell of this grid has a lamp that is initially turned off. You are also given an array...

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[LeetCode] 36. Valid Sudoku

1

[请点击下方图片观看讲解视频](https://www.youtube.com/watch?v=K9fYCNQKXU0) [Click below image to watch YouTube Video](https://www.youtube.com/watch?v=K9fYCNQKXU0) [](https://www.youtube.com/watch?v=K9fYCNQKXU0) Determine if a `9 x 9` Sudoku board is valid. Only the filled cells need to be validated **according to the...

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[LeetCode] 41. First Missing Positive

1

[请点击下方图片观看讲解视频](https://www.youtube.com/watch?v=iJ9rZNC4_PQ) [Click below image to watch YouTube Video](https://www.youtube.com/watch?v=iJ9rZNC4_PQ) [](https://www.youtube.com/watch?v=iJ9rZNC4_PQ) Given an unsorted integer array `nums`, return the smallest missing positive integer. You must implement an algorithm that runs in `O(n)`...

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[LeetCode] 47. Permutations II

1

[请点击下方图片观看讲解视频](https://www.youtube.com/watch?v=z4aLiZuH6VU) [Click below image to watch YouTube Video](https://www.youtube.com/watch?v=z4aLiZuH6VU) [](https://www.youtube.com/watch?v=z4aLiZuH6VU) Given a collection of numbers, `nums`, that might contain duplicates, return _all possible unique permutations in any order._ **Example 1:** Input:...

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[LeetCode] 8. String to Integer (atoi)

3

[请点击下方图片观看讲解视频](https://www.youtube.com/watch?v=JEUC0a3lbZQ) [Click below image to watch YouTube Video](https://www.youtube.com/watch?v=JEUC0a3lbZQ) [](https://www.youtube.com/watch?v=JEUC0a3lbZQ) Implement the `myAtoi(string s)` function, which converts a string to a 32-bit signed integer (similar to C/C++'s `atoi` function). The algorithm...

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[LeetCode] 556. Next Greater Element III

1

  Given a positive 32-bit integer n, you need to find the smallest 32-bit integer which has exactly the same digits existing in the integer n and is greater in value...

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[LeetCode] 140. Word Break II

1

  Given a non-empty string  _s_  and a dictionary  _wordDict_  containing a list of non-empty words, add spaces in  _s_  to construct a sentence where each word is a valid dictionary...

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[LeetCode] 450. Delete Node in a BST

2

  Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of the...

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[LeetCode] 1314. Missing Problem

1

The problem No.1314 has not been added on Leetcode!

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[LeetCode] 334. Increasing Triplet Subsequence

1

  Given an unsorted array return whether an increasing subsequence of length 3 exists or not in the array. Formally the function should: > Return true if there exists  _i, j,...

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