hdu 1536 S-Nim (sg函数)

hdu 1536题目链接

题意：还是若干堆石子，但是每次取的个数只能是集合S中有的数。。问是否必赢。。。

思路：sg函数。。。1A

 

 

 

C++
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/* ***********************************************
Author :111qqz
Created Time :2016年07月20日 星期三 23时32分48秒
File Name :code/hdu/1536.cpp
************************************************ */
 
#include <cstdio>
#include <cstring>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <cmath>
#include <cstdlib>
#include <ctime>
#define fst first
#define sec second
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define ms(a,x) memset(a,x,sizeof(a))
typedef long long LL;
#define pi pair < int ,int >
#define MP make_pair
 
using namespace std;
const double eps = 1E-8;
const int dx4[4]={1,0,0,-1};
const int dy4[4]={0,-1,1,0};
const int inf = 0x3f3f3f3f;
const int N=1E4+7;
int  sg[N];
bool vis[N];
int ok[N];
int k,m;
 
void sg_init()
{
    ms(sg,0);
 
    for ( int i = 1; i < N ; i++)
    {
        ms(vis,false);
        for ( int j = 1 ; j <= k ; j++)
            if (i-ok[j]>=0) vis[sg[i-ok[j]]] = true;
 
        for ( int j = 0 ;  ; j++)
            if (!vis[j])
            {
                sg[i] = j;
                break;
            }
    }
}
int main()
{
        #ifndef  ONLINE_JUDGE
        freopen("code/in.txt","r",stdin);
  #endif
 
        while (~scanf("%d",&k))
        {
            if (k==0) break;
            ms(ok,0);
            for ( int i = 1 ; i <= k ; i++) scanf("%d",&ok[i]);
            sg_init();
            scanf("%d",&m);
//            cout<<"m:"<<m<<endl;
            while (m--)
            {
                int num;
                scanf("%d",&num);
                int sum = 0 ;
                while (num--)
                {
                    int x;
                    scanf("%d",&x);
                    sum^=sg[x];
                }
                if (sum==0) printf("L");
                else printf("W");
            }
            printf("\n");
        }
 
  #ifndef ONLINE_JUDGE  
  fclose(stdin);
  #endif
    return 0;
}
 
 
 
 

作者： CrazyKK

ex-ACMer@hust，stackoverflow-engineer@sensetime

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