Suuremmat

#include <iostream>
using namespace std;
using ll = long long;

void solve() {
	ll n;
	cin >> n;
	for (int i = 1; i <= 18; ++i) {
		for (int j = '1'; j <= '9'; ++j) {
			string s(i, j);
			if (stoi(s) > n) {
				cout << s << '\n';
				return;
			}
		}
	}
}

int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	int t;
	cin >> t;
	for (int i = 0; i < t; ++i) solve();
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 2

Verdict: RUNTIME ERROR

terminate called after throwing an instance of 'std::out_of_range'
  what():  stoi