hdu 2509 博弈 *

 1 #include<cstdio>
 2 #include<iostream>
 3 #include<algorithm>
 4 #include<cstring>
 5 #include<cmath>
 6 #include<queue>
 7 #include<map>
 8 using namespace std;
 9 #define MOD 1000000007
10 const int INF=0x3f3f3f3f;
11 const double eps=1e-5;
12 typedef long long ll;
13 #define cl(a) memset(a,0,sizeof(a))
14 #define ts printf("*****\n");
15 const int MAXN=1005;
16 int n,m,tt;
17 int main()
18 {
19     int i,j,k,ca=1;
20     #ifndef ONLINE_JUDGE
21     freopen("1.in","r",stdin);
22     #endif
23     while(scanf("%d",&n)!=EOF)
24     {
25         int temp=0;
26         int a;
27         int ans;
28         for(i=0;i<n;i++)
29         {
30             scanf("%d",&a);
31             if(i==0)
32             {
33                 ans=a;
34             }
35             else ans^=a;
36         }
37         if(ans==0)
38            printf("No\n");
39         else
40            printf("Yes\n");
41     }
42 }