思路: 博弈. 实现: class Solution { public: bool PredictTheWinner(vector<int>& nums) { ][]; int n = nums.size(); ; i < n; i++) dp[i][i] = nums[i]; ; i >= ; i--) { ; j < n; j++) { dp[i][j] = max(nums[i] - dp[i + ][j], nums[j] - dp[i][j - ]); }…

lc 486 Predict the Winner 486 Predict the Winner 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…

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 for the…

Leetcode之动态规划(DP)专题-486. 预测赢家(Predict the Winner) 给定一个表示分数的非负整数数组. 玩家1从数组任意一端拿取一个分数,随后玩家2继续从剩余数组任意一端拿取分数,然后玩家1拿,…….每次一个玩家只能拿取一个分数,分数被拿取之后不再可取.直到没有剩余分数可取时游戏结束.最终获得分数总和最多的玩家获胜. 给定一个表示分数的数组,预测玩家1是否会成为赢家.你可以假设每个玩家的玩法都会使他的分数最大化. 示例 1: 输入: [1, 5, 2] 输出: Fa…

[LeetCode]486. Predict the Winner 解题报告(Python) 标签(空格分隔): LeetCode 作者: 负雪明烛 id: fuxuemingzhu 个人博客: http://fuxuemingzhu.cn/ 题目地址:https://leetcode.com/problems/predict-the-winner/description/ 题目描述: Given an array of scores that are non-negative integers…

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 for the…

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 for the…

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 for the…

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 for the…

2018-04-22 19:19:47 问题描述: 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 wil…

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 for the…

原题链接在这里:https://leetcode.com/problems/predict-the-winner/description/ 题目: 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. Ea…

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 for the…

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…

题目链接:https://leetcode.com/problems/predict-the-winner/ 1.暴力递归 当前数组左边界:i,右边界:j: 对于先发者来说,他能取到的最大值是:max(arr[i] + second(arr, i + 1, j), arr[j] + second(arr, i, j - 1)); (arr[i] + 作为后发者,在 i+1 到 j 上取得的值),(arr[j] + 作为后发者,在 i 到 j-1 上取得的值) 中大的一个. 对于后发者来说,他是被…

给定一个表示分数的非负整数数组. 玩家1从数组任意一端拿取一个分数,随后玩家2继续从剩余数组任意一端拿取分数,然后玩家1拿,…….每次一个玩家只能拿取一个分数,分数被拿取之后不再可取.直到没有剩余分数可取时游戏结束.最终获得分数总和最多的玩家获胜.给定一个表示分数的数组,预测玩家1是否会成为赢家.你可以假设每个玩家的玩法都会使他的分数最大化.示例 1:输入: [1, 5, 2]输出: False解释: 一开始,玩家1可以从1和2中进行选择.如果他选择2(或者1),那么玩家2可以从1(或者2)和5…

https://leetcode.com/problems/predict-the-winner/ 题目描述:给定一个非负的积分数组,玩家1可以从数组两端任取一个积分,接着玩家2执行同样的操作,直至积分被取尽,总分大的获胜.两人都以最优决策进行游戏.对每个数组输出玩家1是否能获胜. 解法1: 使用递归,两者依次取数. class Solution{ , nums.size()-, , , ); } bool dfs(vector<int>& nums, int st, int en,…

原题 思路: 解法一: 转换比较拿取分数多少的思路,改为考虑 player拿的分数为正,把Player2拿的视为负,加上所有分数,如果最后结果大于0则Player1赢. 思考得出递归表达式: max(nums[beg] - player2(beg + 1, end), nums[end] - player2(beg, end + 1)) 此解法效率很差 104ms,beats 5.32% class Solution { public: bool PredictTheWinner(vector<…

In the "100 game," two players take turns adding, to a running total, any integer from 1..10. The player who first causes the running total to reach or exceed 100 wins. What if we change the game so that players cannot re-use integers? For examp…

463. Island Perimeterhttps://leetcode.com/problems/island-perimeter/就是逐一遍历所有的cell,用分离的cell总的的边数减去重叠的边的数目即可.在查找重叠的边的数目的时候有一点小技巧,就是沿着其中两个方向就好,这种题目都有类似的规律,就是可以沿着上三角或者下三角形的方向来做.一刷一次ac,但是还没开始注意codestyle的问题,需要再刷一遍. class Solution { public: int islandPerime…

The AlphaGo Replication Wiki 摘自:https://github.com/Rochester-NRT/RocAlphaGo/wiki/01.-Home Contents :  Home 01. Home 02. Code 03. Data 04. Neural Networks and Training 05. Supervised Policy Network (Phase I) 06. Reinforcement Policy Network (Phase II)…

请点击页面左上角 -> Fork me on Github 或直接访问本项目Github地址:LeetCode Solution by Swift    说明:题目中含有$符号则为付费题目. 如:[Swift]LeetCode156.二叉树的上下颠倒 $ Binary Tree Upside Down 请下拉滚动条查看最新 Weekly Contest!!! Swift LeetCode 目录 | Catalog 序        号 题名Title 难度     Difficulty  两数之…

突然很想刷刷题,LeetCode是一个不错的选择,忽略了输入输出,更好的突出了算法,省去了不少时间. dalao们发现了任何错误,或是代码无法通过,或是有更好的解法,或是有任何疑问和建议的话,可以在对应的随笔下面评论区留言,我会及时处理,在此谢过了. 过程或许会很漫长,也很痛苦,慢慢来吧. 编号 题名 过题率 难度 1 Two Sum 0.376 Easy 2 Add Two Numbers 0.285 Medium 3 Longest Substring Without Repeating C…

Given a string s, find the longest palindromic subsequence's length in s. You may assume that the maximum length of s is 1000. Example 1:Input: "bbbab" Output: 4 One possible longest palindromic subsequence is "bbbb". Example 2:Input:…

问题 有偶数堆石头(数组长度为偶数),每堆石头有一些石头(数组元素为正),石头的总数是奇数.Alex和Lee两个人轮流取石头堆,每次可以从头部或尾部取,Alex先取. 给定这样一个数组,两人都以最优策略去玩这个游戏,如果Alex一定会获胜则返回True,否则返回False 思路 做法1:因为有偶数堆,所以先玩游戏的Alex可以做到:一直取第偶数堆,或者一直取第奇数堆.石头总数是奇数,那么第偶数堆的石头总数和第奇数堆的石头总数,一定有一方大于另一方.所以Alex可以计算出哪方大来取.假设第奇数堆的…

357. Count Numbers with Unique Digits 解题思路: 用arr[i]存放长度为i时,各位互不相同的数字的个数,所以arr[1]=10,arr[2]=9*9.(第一位要为1,第二位与第一位要不同) arr[3] = arr[2]*8,所以arr[i]=arr[i-1]*(10 - (k-1)).之后求和就可以了. int countNumbersWithUniqueDigits(int n) { if (!n) return 1; if (n == 1) retu…

是周六晚上的几道题,晚上11点半,睡的早,起不来! 494. Target Sum 分析:看完这题,看到数据范围,长度20,枚举就是1<<20 = 1e6, 然后单次20,总共就是2e8,感觉应该是暴力枚举,然后我就按照二进制的方式写了代码,tle了,我感觉应该可以过啊,然后就用dfs写了一下,刚好能过,卡的时间,感觉应该有优化的地方.其实正确的思路是dp,我刚开始感觉也是dp,因为要计算所有的可能,感觉dp也是暴力,算所有可能出现的情况,感觉跟暴力差不多!今天看了下别人的分析,是自己分析错了…

Alex and Lee play a game with piles of stones.  There are an even number of piles arranged in a row, and each pile has a positive integer number of stones piles[i]. The objective of the game is to end with the most stones.  The total number of stones…

In the "100 game," two players take turns adding, to a running total, any integer from 1..10. The player who first causes the running total to reach or exceed 100 wins. What if we change the game so that players cannot re-use integers? For examp…

All LeetCode Questions List(Part of Answers, still updating) 题目汇总及部分答案(持续更新中) Leetcode problems classified by company 题目按公司分类(Last updated: October 2, 2017) .   Top Interview Questions # Title Difficulty Acceptance 1 Two Sum Medium 17.70% 2 Add Two N…