func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   using namespace std;   void subMain() {     double a, b;     cin >> a >> b;     cout << fixed << (b * b - a * a) / (2 * a);   }   int32_t main() {     ios_base::sync_with_stdio(false);     cin.tie(0);     cout.tie(0);     subMain();     cerr <<  Time :   << 1000 * ((double)clock()) / (double)CLOCKS_PER_SEC          <<  ms n ;     return 0;   }   