Hypyt

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

void testCase() {
    int n,m;
    cin >> n >> m;
    int x1 = 0, y1 = 0;
    int x2 = n-1, y2 = m-1;
    for (int i = 0; i < n*m-1; i++) {
        if (i%2 == 0) {
            cout << x2 - x1 << " " << y2 - y1 << "\n";
            x1++;
            if (x1 == n) {
                x1 = 0;
                y1++;
            }
        } else {
            cout << x1 - x2 << " " << y1 - y2 << "\n";
            x2--;
            if (x2 == -1) {
                x2 = n-1;
                y2--;
            }
        }
    }
}
 
int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);

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

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 2

Verdict: ACCEPTED

Test 4

Group: 2

Verdict: ACCEPTED

Test 5

Group: 2

Verdict: ACCEPTED