hdu 2509 Be the Winner (anti-sg,sg函数，sj定理)

 1/* ***********************************************
 2Author :111qqz
 3Created Time :2016年07月23日 星期六 04时41分38秒
 4File Name :code/hdu/2509.cpp
 5************************************************ */
 6
 7#include <cstdio>
 8#include <cstring>
 9#include <iostream>
10#include <algorithm>
11#include <vector>
12#include <queue>
13#include <set>
14#include <map>
15#include <string>
16#include <cmath>
17#include <cstdlib>
18#include <ctime>
19#define fst first
20#define sec second
21#define lson l,m,rt<<1
22#define rson m+1,r,rt<<1|1
23#define ms(a,x) memset(a,x,sizeof(a))
24typedef long long LL;
25#define pi pair < int ,int >
26#define MP make_pair
27
28using namespace std;
29const double eps = 1E-8;
30const int dx4[4]={1,0,0,-1};
31const int dy4[4]={0,-1,1,0};
32const int inf = 0x3f3f3f3f;
33int n;
34int main()
35{
36	#ifndef  ONLINE_JUDGE 
37	freopen("code/in.txt","r",stdin);
38  #endif
39
40
41	while (~scanf("%d",&n))
42	{
43	    int sum =  0;
44	    int cnt = 0 ;
45	    for ( int i = 1 ; i <= n ; i++)
46	    {
47		int x;
48		scanf("%d",&x);
49		sum^=x;
50		if (x>1) cnt++;
51	    }
52	    if ((sum==0&&cnt==0)||(sum>0&&cnt>0))
53	    {
54		puts("Yes");
55	    }
56	    else
57	    {
58		puts("No");
59	    }
60	}
61
62  #ifndef ONLINE_JUDGE  
63  fclose(stdin);
64  #endif
65    return 0;
66}