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…

这是悦乐书的第195次更新，第201篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第57题（顺位题号是232）。使用栈实现队列的以下操作。 push（x） – 将元素x推送到队列…

三种解法 Solution 1 Merge two sorted Lists 两两归并 Time: O(nlogk) 每个单独的listNode参与到归并的话是O(1)(比如一个长度为m的ListNode和一个长度n的L…

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…