1. 题目 You are given an n x n 2D matrix representing an image. Rotate the image by 90 degrees (clockwise). Foll…

题目描述 Given an array of strings, group anagrams together. For example, given: ["eat", "tea", "tan", "ate", "nat…

Decode Ways 最新更新请见：https://yanjia.me/zh/2019/02/… A message containing letters from A-Z is being encoded…

  Given an array of 2n integers, your task is to group these integers into n pairs of…

  In a given integer array nums, there is always exactly one largest element. Find whether the large…

1. 题目 The count-and-say sequence is the sequence of integers beginning as follows:1, 11, 21, 1211, 111221, …

  Given an integer matrix, find the length of the longest increasing path. From each cell, you can either…

  Given a non-empty string check if it can be constructed by taking a substring of it and appending multi…

题目表述 Given n points on a 2D plane, find the maximum number of points that lie on the same straight line. 分析 暴力…

  Given a binary tree, collect a tree’s nodes as if you were doing this: Collect and remove all lea…

题目： Given an array of integers, every element appears three times except for one. Find that single o…

1. 题目 Given a collection of integers that might contain duplicates, nums, return all possible subsets. Note: T…