Passing the Ball

    1#include <bits/stdc++.h>
    2using namespace std;
    3using ll = long long;
    4using i128 = __int128;
    5const int inf = 1e9;
    6const ll INF = 1e18; //❄️
    7void solve() {
    8    int n; cin >> n;
    9    vector<char> v(n); vector<bool> vis(n);
    10    for (int i = 0; i < n; i++) cin >> v[i];
    11    int cnt = 0;
    12    for (int i = 0; i < n;) {
    13        if (vis[i]) {
    14            cout << i + 2 << '\n';
    15            return;
    16        }
    17        vis[i] = 1;
    18        if (v[i] == 'R') i++;
    19        else i--;
    20    }
    21}
    22int main() {
    23    ios::sync_with_stdio(0); cin.tie(0); 
    24    int t; cin >> t;
    25    while (t--) {
    26        solve();
    27    }
    28    return 0;
    29}