Peli

#include <bits/stdc++.h>
typedef long long ll;
using namespace std;

int e[6001];

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

    int t, o = 1;
    cin >> t;
    for (int i = 1; i <= 2000; i++) {
        if (!e[i]) {
            e[i] = i+o;
            e[i+o] = i;
            o++;
        }
    }

    for (int i = 1; i <= t; i++) {
        int a, b;
        cin >> a >> b;
        if (e[a] == b) cout << "second\n";
        else cout << "first\n";
    }
}

Test 1 (public)

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 1, 2, 3

Verdict: ACCEPTED

Test 3

Group: 2, 3

Verdict: ACCEPTED

Test 4

Group: 3

Verdict: ACCEPTED

Test 5

Group: 2, 3

Verdict: ACCEPTED

Test 6

Group: 3

Verdict: ACCEPTED