Pinta-ala

#include <bits/stdc++.h>

using namespace std;

using ll = long long;

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

    for (int i = 0; i < n; ++i) {
        int a, b;
        cin >> a >> b;

        if (a == 1) {
            cout << "YES\n";
            continue;
        }

        bool ok = 0;

        for (int ta = 1; ta * ta <= a; ++ta) {
            if (a % ta != 0) continue;

            int tb = a / ta;

            if ((ta + 1) * (tb + 1) == b) {
                ok = 1;
                break;
            }
        }

        cout << (ok ? "YES" : "NO") << "\n";
    }

    return 0;
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: WRONG ANSWER

Test 3

Verdict: WRONG ANSWER