Given two 1d vectors, implement an iterator to return their elements alternately. For example, given tw…

  Given two strings s1 and s2, write a function to return true if s2 contains th…

  Given the running logs of n functions that are executed in a nonpreemptive single threaded CP…

题目： Given a 2D board and a word, find if the word exists in the grid. The word can be constructed from letters…

Easy Find K-th largest element in N arrays. Notice You can swap elements in the array Have you met this questi…

Dota2 参议院【中等】 Dota2 的世界里有两个阵营：Radiant(天辉)和 Dire(夜魇) Dota2 参议院由来自两派的参议员组成。现在参议院希望对一个 Dota2 游戏里的改变作出决定。他们以一个基于轮为…

  Invert a binary tree. 4 / \ 2 7 / \ / \ 1 3 6 9 to 4 / \ 7 2 / \ / \ 9 6 3 1 Trivia: This problem was i…

  Consider the string s to be the infinite wraparound string of “abcdefghijklmnopqrstuvwx…

  You need to construct a string consists of parenthesis and integers from a binary tree with the preorde…

题目： Given a string s, partition s such that every substring of the partition is a palindrome. R…

题目： Given an array and a value, remove all instances of that value in place and return the new length. The ord…

Given an array of n positive integers and a positive integer s, find the minimal length of a contiguous subarr…