func_code_string: #include <bits/stdc++.h>   using namespace std;   const double EPS = 1e-9;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     int n;     double u, v, w, x, y, l = 1e9, r = 0;     cin >> n >> w >> v >> u;     while (n--) {       cin >> x >> y;       l = min(l, x - y / u * v);       r = max(r, x - y / u * v);     }     cout << fixed << setprecision(6) << w / u + r / v * (l < 0);     return 0;   }   