题目如下: Given an array A of 0s and 1s, divide the array into 3 non-empty parts such that all of these parts represent the same binary value. If it is possible, return any [i, j] with i+1 < j, such that: A[0], A[1], ..., A[i] is the first part; A[i+1],…

作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 目录 题目描述 题目大意 解题方法 DFS 动态规划 日期 题目地址:https://leetcode.com/problems/partition-equal-subset-sum/description/ 题目描述 Given a non-empty array containing only positive integers, find if the array can be…

题目如下: You are given two strings s and t of the same length. You want to change s to t. Changing the i-th character of s to i-th character of t costs |s[i] - t[i]| that is, the absolute difference between the ASCII values of the characters. You are al…

题目如下: Given an array nums of positive integers, return the longest possible length of an array prefix of nums, such that it is possible to remove exactly one element from this prefix so that every number that has appeared in it will have the same num…

题目如下: 解题思路:对于这种判断是否的题目,首先看看动态规划能不能解决.本题可以看成是从nums中任选i个元素,判断其和是否为sum(nums)/2,很显然从nums中任选i个元素的和的取值范围是[0,sum(nums)],这里就可以用一个dp数组来保存nums中任选i个元素的和的取值的和,记dp[v] = 1表示可以从nums中任选i个元素使得其和等于v,dp[v] = 0 则表示不可以.那么nums中任意元素nums[i]来说,只要找出dp[0,sum(nums[0:i-1])] 中所有为…

题目如下: 解题思路:本题是[leetcode]473. Matchsticks to Square的姊妹篇,唯一的区别是[leetcode]473. Matchsticks to Square指定了分成四个子数组,而本题分成的份数不定,作为参数输入.另外,本题的测试用例好像复杂一点,因此我过滤掉了nums中值等于avg的元素,不参与后面的DFS计算,提高效率. 代码如下: class Solution(object): def canPartitionKSubsets(self, nums,…

题目如下: Given an array of scores that are non-negative integers. Player 1 picks one of the numbers from either end of the array followed by the player 2 and then player 1 and so on. Each time a player picks a number, that number will not be available f…

题目如下: 解题思路:几乎和[leetcode]719. Find K-th Smallest Pair Distance 的方法一样.只不过一个是减法一个是乘法,还有一点区别是[leetcode]719. Find K-th Smallest Pair Distance中i-j和j-i只算一个元素,而本题中i*j与j*i算两个元素. 代码如下: class Solution(object): def findKthNumber(self, m, n, k): """ :ty…

[LeetCode]760. Find Anagram Mappings 解题报告 标签(空格分隔): LeetCode 题目地址:https://leetcode.com/problems/find-anagram-mappings/description/ 题目描述: Given two lists Aand B, and B is an anagram of A. B is an anagram of A means B is made by randomizing the order o…

[LeetCode]299. Bulls and Cows 解题报告(Python) 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/bulls-and-cows/description/ 题目描述: You are playing the following Bulls and Cows game with your friend: You write down…