Little elephant and candies wrong answer...please help..

Can someone please tell me what is wrong with this code? Thanks in advance..

#include <iostream>

using namespace std;

int main()
{
   int t,n,c,a,sum;
   cin>>t;
   while(t>0)
    {
        cin>>n>>c;
        sum=0;
        for(int i=0;i<n;i++)
           {
            cin>>a;
            sum+=a;
           }
         if(sum>=c)
            cout<<"Yes\n";
         else
            cout<<"No\n";
        t--;
    };

   return 0;
}