$#doanthevu$

Code C++:

#include <bits/stdc++.h>
using namespace std;
int main() {
    int N, K;
    cin >> N >> K;
    int kk, pp;
    switch (K % 2) {
        case 0:
            kk = (K - 2 * N) / 2;
            pp = (3 * N - K) / 2;
            break;
        case 1:
            cout << "-1" << endl;
            return 0;
    }
    if (kk >= 0 && pp >= 0) {
        cout << kk << endl;
        cout << pp << endl;
    } 
    return 0;
}

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

int main() {
    int a, b;
    cin >> a >> b;
    int c, d;

    for (c = 0; c <= a; ++c) {
        d = a - c;
        switch (b) {
            case 2 * c + 4 * d:
                cout << c << " " << d;
                break;
            default:
                break;
        }
    }

    return 0;
}

bonus thêm toán học nếu cần:

#include <bits/stdc++.h>

using namespace std;

int main()
{
    long long n, m, x, y;
    cin >> n >> m;
    x = m / 2 - n;
    y = n - x;
    cout << y << " " << x;
    return 0;
}