描述 Given an array nums, write a function to move all 0's to the end of it while maintaining the relative order of the non-zero elements. Note: 1.You must do this in-place without making a copy of the array. 2.Minimize the total number of operations.…

描述 Given an array and a value, remove all instances of that value in-place and return the new length. Do not allocate extra space for another array, you must do this by modifying the input array in-place with O(1) extra memory. The order of elements…

这是悦乐书的第183次更新,第185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42题(顺位题号是172).给定一个整数n,返回n!中的尾随零数.例如: 输入:3 输出:0 说明:3! = 6,没有尾随零. 输入:5 输出:1 说明:5! = 120,一个尾随零. 本次解题使用的开发工具是eclipse,jdk使用的版本是1.8,环境是win7 64位系统,使用Java语言编写和测试. 02 第一种解法 特殊情况:当n小于等于0的时候,直接返回0. 先把n的阶乘…

描述 Follow up for "Remove Duplicates": What if duplicates are allowed at most twice? 示例 Given sorted array nums = [1,1,1,2,2,3], Your function should return length = 5, with the first five elements of nums being 1, 1, 2, 2 and 3. It doesn't matte…

描述 Given an unsorted array of integers, find the length of the longest consecutive elements sequence. Your algorithm should run in O(n) complexity. 示例 Given [100, 4, 200, 1, 3, 2], The longest consecutive elements sequence is [1, 2, 3, 4]. Return its…

描述 Given an array of integers, return indices of the two numbers such that they add up to a specific target. You may assume that each input would have exactly one solution, and you may not use the same element twice. 示例 Given nums = [2, 7, 11, 15], t…

描述 Given an array S of n integers, are there elements a, b, c in S such that a + b + c = 0? Find all unique triplets in the array which gives the sum of zero. Note: The solution set must not contain duplicate triplets. 示例 Given array S = [-1, 0, 1, 2…

描述 Given an array S of n integers, find three integers in S such that the sum is closest to a given number, target. Return the sum of the three integers. You may assume that each input would have exactly one solution. 示例 Given array S = {-1 2 1 -4},…

描述 Given an array S of n integers, are there elements a, b, c, and d in S such that a + b + c + d = target? Find all unique quadruplets in the array which gives the sum of target. Note: The solution set must not contain duplicate quadruplets. 示例 Give…

描述 Implement next permutation, which rearranges numbers into the lexicographically next greater permutation of numbers. If such arrangement is not possible, it must rearrange it as the lowest possible order (ie, sorted in ascending order). The replac…