Error only in one test case, when n =10^5

#include <iostream>
#include<bits/stdc++.h>
using namespace std;


int main() {
  ios_base::sync_with_stdio(false);
   cin.tie(NULL);
   cout.tie(NULL);
  int t;
  cin>>t;
  int arr[t];
  int arrfreq[t];
  int sum=1;
  for(int i=0;i<t;i++ )
  {
    cin>>arr[t];
    sum+=arr[t];
    arrfreq[i]=sum;


  }



int m;
cin>>m;
int qsn[m];
int k;
for(int i =0;i<m;i++)
{
  cin>>qsn[i];



}

for(int j =0;j<t;j++)
{
    if(k<arrfreq[j])
    {
      cout<<j+1<<"\n";
      break;

    }
    if(k==arrfreq[j])
      {
        cout<<j+2<<"\n";
        break;
      }









}



}