Given a collection of intervals, merge all overlapping intervals. For example, Given [1,3],[2,6],[8,10]…

题目描述 Given a string containing just the characters ‘(‘, ‘)’, ‘{‘, ‘}’, ‘[‘ and ‘]’, determine if the input str…

In a N x N grid composed of 1 x 1 squares, each 1 x 1 square consists of a /, , or blank space. These characte…

Given a binary tree, find the leftmost value in the last row of the tree. Example 1: Input: 2 / \ 1 3 Output: …

Longest Substring with At Most Two Distinct Characters 最新思路解法：https://yanjia.me/zh/2018/12/… Given a str…

题目地址：https://leetcode-cn.com/probl…题目描述：在给定的二维二进制数组 A 中，存在两座岛。（岛是由四面相连的 1 形成的一个最大组。） 现在，我们可以将 0 变为 1，以使两…

Search a 2D Matrix I Write an efficient algorithm that searches for a value in an m x n matrix. This matrix ha…

1. 题目 Given a matrix of m x n elements (m rows, n columns), return all elements of the matrix in spiral order.…

  Solve a given equation and return the value of x in the form of string “x=#value”…

题目： Implement atoi to convert a string to an integer. Hint: Carefully consider all possible inp…

  Given n pairs of parentheses, write a function to generate all combinations of well-formed pa…

  Given a binary tree and a sum, find all root-to-leaf paths where each path’s sum equals the given…