A Simple Nim（sg打表找规律）

Two players take turns picking candies from n heaps,the player who picks the last one will win the game.On each turn they can pick any number of candies which come from the same heap(picking no candy is not allowed).To make the game more interesting,players can separate one heap into three smaller heaps(no empty heaps)instead of the picking operation.Please find out which player will win the game if each of them never make mistakes.  

 

Input Intput contains multiple test cases. The first line is an integer 1≤T≤100, the number of test cases. Each case begins with an integer n, indicating the number of the heaps, the next line contains N integers s[0],s[1],....,s[n−1], representing heaps with s[0],s[1],...,s[n−1] objects respectively.(1≤n≤106,1≤s[i]≤109)  

 

Output For each test case,output a line whick contains either"First player wins."or"Second player wins".  

 

Sample Input 2 2 4 4 3 1 2 4  

 

Sample Output Second player wins. First player wins.  

 

Author UESTC  

 

Source 2016 Multi-University Training Contest 6  

 

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#include<iostream>
#include<stdio.h>
#include<algorithm>
#include<string.h>
#include<vector>
using namespace std;
typedef long long ll;


//void getsg(int x){
//    memset(vis,0,sizeof(vis));
//    for(int i=0;i<x;i++){
//        vis[sg[i]]=1;
//    }
//    for(int i1=1;i1<x;i1++){
//        for(int i2=1;i2<x;i2++){
//            for(int i3=1;i3<x;i3++){
//                if(i1+i2+i3==x) vis[sg[i1]^sg[i2]^sg[i3]]=1;
//            }
//        }
//    }
//    for(int i=0;;i++){
//        if(vis[i]==0){
//            sg[x]=i;
//            break;
//        }
//    }
//}


int main(){
//    for(int i=1;i<=50;i++){
//        getsg(i);
//        printf("i:%d %d   %d\n",i,sg[i],sg[i]==i);
//    }
    int t;
    scanf("%d",&t);
    while(t--){
        int n;
        scanf("%d",&n);
        int ans=0;
        int tem;
        for(int i=1;i<=n;i++){
            scanf("%d",&tem);
            if(tem%8==0) tem--;
            else if(tem%8==7) tem++;
            ans=ans^tem;            
        }
        if(ans==0) printf("Second player wins.\n");
        else printf("First player wins.\n");
    }
}