题目： Given a string containing just the characters '(' and ')', find the length of the longest v…

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it.Note: You may …

  Sort a linked list in O(n log n) time using constant space complexity. Example 1: Input:…

  Given two strings A and B, find the minimum number of times A has to be repeated such that B is a subst…

题目： Given an array of words and a length L, format the text such that each line has exactly L c…

题目描述 Given two integers representing the numerator and denominator of a fraction, return the fraction in strin…

Word Ladder Given two words (beginWord and endWord), and a dictionary, find the length of shortest transformat…

19. Remove Nth Node From End of List 题目 Given a linked list, remove the nth node from the end of list and retu…

  Given an array of integers and an integer k, return true if and only if there are two distinct indices …

  Given a non-empty binary search tree and a target value, find the value in the BST that is closest to t…

题目： Given a sorted array, remove the duplicates in place such that each element appear only once and…

Basic Calculator Implement a basic calculator to evaluate a simple expression string. The expression string ma…