hdu2509

 1 //Accepted 0MS 232K

 2 #include <cstdio>

 3 #include <cstring>

 4 int ans;

 5 int t;

 6 int n;

 7 void slove()

 8 {

 9     int x;

10     ans=0;

11     t=0;

12     for (int i=0;i<n;i++)

13     {

14         scanf("%d",&x);

15         ans=ans^x;

16         if (x>1) t++;

17     }

18     if ((ans==0 && t>=2) || (ans!=0 && t==0))

19     {

20         printf("No\n");

21     }

22     else

23     {

24         printf("Yes\n");

25     }

26 }

27 int main()

28 {

29     while (scanf("%d",&n)!=EOF)

30     {

31         slove();

32     }

33     return 0;

34 }

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