Car

#include <iostream>
#include <math.h>
#include <iomanip>
using namespace std;

long double d;

int main(){
  cin >> d;
  
  long double a=0;
  long double b=1000000000;
  for (int i=0;  i<1000; ++i){
    long double m=(a+b)/2;
    if (exp(m)+sqrt(m)<d) a=m;
    else b=m;
  }
  cout << fixed << setprecision(7)  << a << "\n";
}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED