Divisible sub arrays

#1

#include<bits/stdc++.h>
using namespace std;
int main()
{
int t;
cin>>t;
long long int n;
long long int a[10000005];

  while(t--)
  {
  //int n;
  cin>>n;
  //int a[n];
  for(int i=0;i<n;i++)
  cin>>a[i];
  long long int s=0,c=0;
  long long int prefixsum[10000005]={0};
  for(int i=0;i<n;i++)
  {
        s += a[i];
        s = s%n;
        s = (s+n)%n;
        prefixsum[s]++;
        //if(s==0)
        //{
          //    c++;
            //  s=0;
        //}
  }
  long long int ans=(prefixsum[0]*(prefixsum[0]+1))/2;
  for(long long int i=1;i<n;i++)

{
ans=ans+(prefixsum[i]*(prefixsum[i]-1))/2;
}
cout<<ans;
cout<<endl;
}
}
i am getting run time error

#2

now your code works fine https://ide.codingblocks.com/s/313569

#3

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