Hypyt

#include <bits/stdc++.h>

#define pii pair<int, int>

using namespace std;
 
int main() {
    int t;
    cin>>t;
    while (t --> 0) {
        int n, m;
        cin>>n>>m;
        vector<pii> v;
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                v.push_back({i, j});
            }
        }
        int i = 0;
        int j = v.size() - 1;
        bool turn = false;
        while (i < j) {
            if (turn) {
                cout<<(v[i].first - v[j].first)<<" "<<(v[i].second - v[j].second)<<endl;
                j--;
            } else {
                cout<<(v[j].first - v[i].first)<<" "<<(v[j].second - v[i].second)<<endl;
                i++;
            }
            turn = !turn;
        }
    }
}

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