func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   #pragma GCC optimize( no-stack-protector )   #pragma GCC optimize( unroll-loops )   #pragma GCC target( sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,tune=native )   #pragma GCC optimize( fast-math )   #pragma warning(disable : 4996)   using namespace std;   const int MAXN = 100001;   const int inf = 1000000000;   const long double INF = 1.0 / 0.0;   const long double EPS = 1e-7;   const int mod = inf + 7;   const long double PI = acos(-1.0);   signed main() {     ios_base::sync_with_stdio(0);     cout.tie(0);     cin.tie(0);     ;     long double d, l, v1, v2;     cin >> d >> l >> v1 >> v2;     cout << fixed << (l - d) / (v1 + v2);   }   