func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     double a, v;     cin >> a >> v;     double l, d, w;     cin >> l >> d >> w;     w = min(w, v);     double s = w / a;     double t = a * s * s / 2;     double thead = 0;     double vhead = 0;     if (t < d) {       double t1 = v / a;       double t2 = (v - w) / a;       double dd = t1 * v / 2 + t2 * (v + w) / 2;       if (dd < d) {         double t3 = (d - dd) / v;         thead = t1 + t2 + t3;         vhead = w;       } else {         double vv = sqrt((2 * a * d + w * w) / 2);         thead = vv / a + (vv - w) / a;         vhead = w;       }     } else {       thead = sqrt(2 * d / a);       vhead = a * thead;     }     double ttail = 0;     double tt = (-vhead + sqrt(vhead * vhead + 2 * a * (l - d))) / a;     if (vhead + tt * a < v) {       ttail = tt;     } else {       double t1 = (v - vhead) / a;       double rest = (l - d) - (vhead + v) * t1 / 2;       double t2 = rest / v;       ttail = t1 + t2;     }     cout << setiosflags(ios::fixed) << setprecision(12);     cout << thead + ttail << endl;     return 0;   }   