Given n points in the plane that are all pairwise distinct, a “boomerang” is a tuple of poi…

题目： Follow up for “Remove Duplicates”: What if duplicates are allowed at most twice? For exam…

  Given a binary tree, return the tilt of the whole tree. The tilt of a tree node is defin…

  There is a strange printer with the following two special requirements: The printer can only print a se…

题目描述 Given two integers n and k, return all possible combinations of k numbers out of 1 … n. For example, If n…

Substring with Concatenation of All Words You are given a string, s, and a list of words, words, that are all …

Implement strStr() 最新更新：https://yanjia.me/zh/2019/02/… Implement strStr(). Returns the index of the firs…

1. 题目 Given an integer n, generate all structurally unique BST’s (binary search trees) that store values…

  You have a number of envelopes with widths and heights given as a pair of integers (w, h). One envelope…

  There are a number of spherical balloons spread in two-dimensional space. For each balloon, provided in…

  Given an array consisting of n integers, find the contiguous subarray of given length k&…

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