func_code_string: #include <bits/stdc++.h>   using namespace std;   int delta[1000000], cnt[1000000];   int main() {     int n, m, dx, dy;     cin >> n >> m >> dx >> dy;     int x = 0, y = 0;     delta[0] = 0;     for (int i = 1; i < n; ++i) {       x = (x + dx) % n;       y = (y + dy) % n;       delta[x] = y;     }     for (int i = 0; i < n; ++i) cnt[i] = 0;     for (int i = 0; i < m; ++i) {       cin >> x >> y;       ++cnt[(y + n - delta[x]) % n];     }     int ans = 0;     for (int i = 0; i < n; ++i)       if (cnt[ans] < cnt[i]) ans = i;     cout << 0 <<     << ans << endl;   }   