func_code_string: #include <bits/stdc++.h>   using namespace std;   void solve() {     int n, m;     cin >> n >> m;     vector<pair<int, int> > v;     v.resize(n * m);     for (int i = 1; i <= n; ++i) {       for (int j = 1; j <= m; ++j) {         v[m * (i - 1) + j - 1] = {i, j};       }     }     bool low = true;     int l = 0, r = m * n - 1;     while (r >= l) {       pair<int, int> u;       if (low) {         u = v[l];         l++;         low = false;       } else {         u = v[r];         r--;         low = true;       }       cout << u.first <<     << u.second <<   n ;     }   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     int t = 1;     for (int i = 0; i < t; ++i) {       solve();     }   }   