样例过了但是全WA，为什么啊

#include <iostream>
#include <cstdio>
#include <algorithm>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <iomanip>
using namespace std;
typedef long long ll;
const ll maxn=10010;
ll a[maxn],n,m,b[maxn];
int main()
{
	cin>>n;
	for(int i = 1;i <= n;i++)
	{
		cin>>m;
		for(int i = 1;i <= m;i++)
		{
			cin>>a[i];
			b[i]=b[i-1]+a[i];
			
		}
		for(int i = 1;i <= m;i++)
		{
			if(b[i]==b[m]/2)
			{
				cout<<"Yes"<<endl;
				break;
			}
			else if(i==m)
			{
				cout<<"No"<<endl;
			}
			
		}
		
	}
	return 0;
}