#include<bits/stdc++.h>
using namespace std;
#define int long long
#define endl "\n"
#define ff first
#define ss second
#define pb push_back
#define all(a) a.begin(),a.end()
#define rall(a) a.rbegin(),a.rend()
#define f(i,x,y) for(int i=x;i<y;i++)
#define f2(i,x,y) for(int i=x;i>=y;i--)
#define pii pair<int,int>
#define Fast ios_base::sync_with_stdio(false);cin.tie(NULL);cout.tie(NULL);
const int MOD =1000000007;
const int INF = 1e18;
const int N = 2e5;
 
void solve(int tc){
    int n; cin >> n;
    int sum = 0;
    for(int i=0,x;i<n;i++){
        cin >> x;
        sum += x;
    }
    int low = 1,high = 1e9,mx=0;
    while(low <= high){
        int mid = (low + high) >> 1;
        int val = mid*(mid+1)/2;
        if(val<=sum){
            mx = max(mx,mid);
            low = mid + 1;
        }
        else high = mid - 1;
    }
    cout << mx+1 << endl;
}
int32_t main(){

    Fast

    int t=1;

    cin >> t;

    for(int tc=1;tc<=t;tc++){

        solve(tc);
    }
    return 0;
}