题意: 给一个矩阵,每一次一个玩家可以从任意一行中选任意数量的格子并从中拿石头(但最后总数要大于等于1),问你谁赢 思路: 一开始以为只能一行拿一个... 将每一行石子数相加就转化为经典的Nim博弈 代码: #include<cstdio> #include<iostream> #include<algorithm> const int N = 100000+5; const int INF = 0x3f3f3f3f; using namespace std; int…

You are given an n x n chess board. Only pawn is used in the 'Incredible Chess' and they can move forward or backward. In each column there are two pawns, one white and one black. White pawns are placed in the lower part of the board and the black pa…

A - Matrix Game Time Limit:2000MS     Memory Limit:32768KB     64bit IO Format:%lld & %llu Submit Status Description Given an m x n matrix, where m denotes the number of rows and n denotes the number of columns and in each cell a pile of stones is gi…

Alice and Bob are playing game of Misère Nim. Misère Nim is a game playing on k piles of stones, each pile containing one or more stones. The players alternate turns and in each turn a player can select one of the piles and can remove as many stones…

主要是写一下nim博弈的理解,这个题有点奇怪,不知道为什么判断奇偶性,如果有大佬知道还请讲解一下. //nim博弈 //a[0]~a[i] 异或结果为k 若k=0 则为平衡态 否则为非平衡态 //平衡态转化为非平衡态 :一定有 a[n]^k<a[n] a[0]^--a[n]^k--^a[i]=0 //二进制为什么能判断平衡态 并且转化 将每一对转化为二进制的小堆 /*,每个正整数都有对应的一个二进制数, 例如:57(10)à 111001(2) ,即:57(10)=25+24+23+20. 于是…

codeforces 812E Sagheer and Apple Tree 题意 一棵带点权有根树,保证所有叶子节点到根的距离同奇偶. 每次可以选择一个点,把它的点权删除x,它的某个儿子的点权增加x.点权中途中不能为负.如果选中的是叶子节点,则只删除它的点权. 两个人玩博弈,后手可以先交换两个点点权,问有多少种方法使得他必胜? 题解 观察一下可以发现,把和叶节点同奇偶的那些点拉出来,相比nim博弈多了一种操作:增加一些石子在某堆.不过本质不会有什么变化,因为如果A选择增加,B可以选择减少相同的…

Matches Game Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 12325   Accepted: 7184 题目链接:http://poj.org/problem?id=2234 Description: Here is a simple game. In this game, there are several piles of matches and two players. The two player…

Be the Winner Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4939    Accepted Submission(s): 2724 Problem Description Let's consider m apples divided into n groups. Each group contains no more…

John Time Limit: 5000/1000 MS (Java/Others)    Memory Limit: 65535/32768 K (Java/Others)Total Submission(s): 6162    Accepted Submission(s): 3584 Problem Description Little John is playing very funny game with his younger brother. There is one big bo…

Northcott Game Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 4549    Accepted Submission(s): 2092 Problem Description Tom和Jerry正在玩一种Northcott游戏,可是Tom老是输,因此他怀疑这个游戏是不是有某种必胜策略,郁闷的Tom现在向你求救了,你能帮帮他…