Nim

Posted fighting-sh

tags:

篇首语:本文由小常识网(cha138.com)小编为大家整理,主要介绍了Nim相关的知识,希望对你有一定的参考价值。

Nim

http://poj.org/problem?id=2975

Time Limit: 1000MS   Memory Limit: 65536K
Total Submissions: 7233   Accepted: 3437

Description

Nim is a 2-player game featuring several piles of stones. Players alternate turns, and on his/her turn, a player’s move consists of removing one or more stones from any single pile. Play ends when all the stones have been removed, at which point the last player to have moved is declared the winner. Given a position in Nim, your task is to determine how many winning moves there are in that position.

A position in Nim is called “losing” if the first player to move from that position would lose if both sides played perfectly. A “winning move,” then, is a move that leaves the game in a losing position. There is a famous theorem that classifies all losing positions. Suppose a Nim position contains n piles having k1k2, …, kn stones respectively; in such a position, there are k1 + k2 + … + kn possible moves. We write each ki in binary (base 2). Then, the Nim position is losing if and only if, among all the ki’s, there are an even number of 1’s in each digit position. In other words, the Nim position is losing if and only if the xor of the ki’s is 0.

Consider the position with three piles given by k1 = 7, k2 = 11, and k3 = 13. In binary, these values are as follows:

 111
1011
1101

There are an odd number of 1’s among the rightmost digits, so this position is not losing. However, suppose k3 were changed to be 12. Then, there would be exactly two 1’s in each digit position, and thus, the Nim position would become losing. Since a winning move is any move that leaves the game in a losing position, it follows that removing one stone from the third pile is a winning move when k1 = 7, k2 = 11, and k3 = 13. In fact, there are exactly three winning moves from this position: namely removing one stone from any of the three piles.

Input

The input test file will contain multiple test cases, each of which begins with a line indicating the number of piles, 1 ≤ n ≤ 1000. On the next line, there are n positive integers, 1 ≤ ki ≤ 1, 000, 000, 000, indicating the number of stones in each pile. The end-of-file is marked by a test case with n = 0 and should not be processed.

Output

For each test case, write a single line with an integer indicating the number of winning moves from the given Nim position.

Sample Input

3
7 11 13
2
1000000000 1000000000
0

Sample Output

3
0

 

 

题目问先手开局有多少中必胜的策略。

因为nim博弈中,异或和为0先手必败,所以可以枚举每一个数,看它是否大于其他数的异或值

技术图片
 1 #include<iostream>
 2 using namespace std;
 3 #define lson l,mid,rt<<1
 4 #define rson mid+1,r,rt<<1|1
 5 #define sqr(x) ((x)*(x))
 6 #define maxn 100005
 7 typedef long long ll;
 8 typedef unsigned long long ull;
 9 const ull MOD=257;
10 /*#ifndef ONLINE_JUDGE
11         freopen("1.txt","r",stdin);
12 #endif */
13 
14 int a[1005];
15 
16 
17 int main(){
18     #ifndef ONLINE_JUDGE
19      //   freopen("1.txt","r",stdin);
20     #endif
21     std::ios::sync_with_stdio(false);
22     int n;
23     while(cin>>n){
24         if(!n) break;
25         int sum=0;
26         int ans=0;
27         for(int i=1;i<=n;i++) cin>>a[i],sum^=a[i];
28         for(int i=1;i<=n;i++){
29             if((a[i]^sum)<a[i]){
30                 ans++;
31             }
32         }
33         cout<<ans<<endl;
34     }
35 }
View Code

 

以上是关于Nim的主要内容,如果未能解决你的问题,请参考以下文章

如何从 Nim 的导入失败中恢复?

Nim函数调用的几种形式

bzoj4589 Hard Nim

如何正确创建一个nim / nimrod windows dll

LeetCode刷题NIM游戏:妙解

bzoj2819: Nim(博弈+树剖)