func_code_string: #include <bits/stdc++.h>   using namespace std;   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     double d, L, v1, v2;     cin >> d >> L >> v1 >> v2;     double distance;     int i, r;     cout << fixed << setprecision(20) << (L - d) / (v1 + v2);     return 0;   }   