#include <bits/stdc++.h>
#include <atcoder/string>
using namespace std;
void solve() {
  int N;
  cin >> N;
  string S;
  cin >> S;
  vector<int> sa = atcoder::suffix_array(S);
  vector<int> z = atcoder::z_algorithm(S);
  int ans = 0;
  for(int i = 0; i < N; i++) {
    if(sa[i] == 0) {
      ans += N - 1 - i;
      break;
    }
    int u = z[sa[i]];
    if(u + sa[i] == N) {
      if(u < (N + 1) / 2) {
        ans++;
      }
    }
  }
  cout << ans << '\n';
}
int main() {
  cin.tie(0); cout.tie(0);
  ios::sync_with_stdio(false);
  int T;
  cin >> T;
  while(T--) {
    solve();
  }
  return 0;
}