Given the root node of a binary search tree (BST) and a value. You need to find the node in the BST tha…

题目： Given n, how many structurally unique BST’s (binary search trees) that store values 1…

1. 题目 Given a non-negative number represented as an array of digits, plus one to the number. The digits are st…

81. Search in Rotated Sorted Array II 题目 Follow up for "Search in Rotated Sorted Array": What if duplicates ar…

71. Simplify Path 题目 Given an absolute path for a file (Unix-style), simplify it. For example, path = "/home/"…

  Given an array of integers, 1 ≤ a[i] ≤ n (n = size of array), some elements appear …

  Given an input string (s) and a pattern (p), implement regular expression matching with support for&nbs…

  You are a product manager and currently leading a team to develop a new product. Unfortunately, the lat…

  Design a simplified version of Twitter where users can post tweets, follow/unfollow another user and is…

题目描述 Given an array with n objects colored red, white or blue, sort them so that objects of the same color are…

1. 题目 Given a list, rotate the list to the right by k places, where k is non-negative. For example:Given 1->…

1. 题目 Given a string containing just the characters ‘(‘ and ‘)’, find the length of th…