hdu 5146 Sequence

 1 #include <cstdio>
 2 #include <cstring>
 3 #include <algorithm>
 4 #define maxn 1001
 5 #define ll long long
 6 using namespace std;
 7 
 8 int t;
 9 int n;
10 int a[maxn];
11 
12 int main()
13 {
14     scanf("%d",&t);
15     while(t--)
16     {
17         ll sum1=0,sum2=0;
18         scanf("%d",&n);
19         for(int i=0; i<n; i++)
20         {
21             scanf("%d",&a[i]);
22             if(i%2==0)
23             {
24                 sum1+=a[i];
25             }
26             else
27             {
28                 sum2+=a[i];
29             }
30         }
31         bool flag=false;
32         for(int i=0; i<=n/2; i++)
33         {
34             if(a[i]!=a[n-1-i])
35             {
36                 flag=true;
37                 break;
38             }
39         }
40         if(sum1==sum2&&flag)
41         {
42             printf("Yes\n");
43         }
44         else printf("No\n");
45     }
46     return 0;
47 }