1. 题目 Given two integers n and k, return all possible combinations of k numbers out of 1 … n. For exampl…

  Design a Phone Directory which supports the following operations:   get: Provide a number which is…

  Median is the middle value in an ordered integer list. If the size of the list is even, there is no mid…

  Given a non-empty 2D array grid of 0’s and 1’s, an island is a group of…

题目描述 Given a 2d grid map of ‘1’s (land) and ‘0’s (water), count the number of islands. An island is surrounded…

最新更新请见：https://yanjia.me/zh/2019/01/… There are n cities connected by m flights. Each fight starts from …

  You are given several logs that each log contains a unique id and timestamp. Timestamp is a string that…

题目： Find the contiguous subarray within an array (containing at least one number) which has the largest sum. F…

  You are playing the following Bulls and Cows game with your friend: You write a 4-digit secre…

  Given a set of intervals, for each of the interval i, check if there exists an interval j whose start p…

  Given a list of strings, you could concatenate these strings together into a loop, where for each strin…

  On a staircase, the i-th step has some non-negative cost cost[i] assigned (0 indexed). O…