leetcode
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grandyang
Provide all my solutions and explanations in Chinese for all the Leetcode coding problems.
[请点击下方图片观看讲解视频](https://www.youtube.com/watch?v=PtnQCQivphA) [Click below image to watch YouTube Video](https://www.youtube.com/watch?v=PtnQCQivphA) [](https://www.youtube.com/watch?v=PtnQCQivphA) Given an input string `s` and a pattern `p`, implement regular expression matching with support for `'.'` and `'*'` where: *...
Given a `m x n` matrix `mat` and an integer `threshold`, return _the maximum side-length of a square with a sum less than or equal to _`threshold`_ or return _`0`_ ...
An integer has _sequential digits_ if and only if each digit in the number is one more than the previous digit. Return a sorted list of all the integers in...
Given `head` which is a reference node to a singly-linked list. The value of each node in the linked list is either `0` or `1`. The linked list holds the...
Given an `n x n` integer matrix `grid`, return _the minimum sum of a falling path with non-zero shifts_. A falling path with non-zero shifts is a choice of exactly...
Given an array `intervals` where `intervals[i] = [li, ri]` represent the interval `[li, ri)`, remove all intervals that are covered by another interval in the list. The interval `[a, b)` ...
Given an integer array sorted in non-decreasing order, there is exactly one integer in the array that occurs more than 25% of the time, return that integer. Example 1: Input:...
Design the `CombinationIterator` class: * `CombinationIterator(string characters, int combinationLength)` Initializes the object with a string `characters` of sorted distinct lowercase English letters and a number `combinationLength` as arguments. * `next()` ...
Given a `m x n` binary matrix `mat`. In one step, you can choose one cell and flip it and all the four neighbors of it if they exist (Flip...
Given an array of integers `nums` and an integer `threshold`, we will choose a positive integer `divisor`, divide all the array by it, and sum the division's result. Find the ...