Car

#include <bits/stdc++.h>
using namespace std;

double x,d,f,e;

int main(){ 
    e=2.71828182845904523536;
cin>>d;
    if(d<2){
     for(int i=0; i<1000; i++) { 
        
         x=pow(d,2)-2*d*pow(e,x)+pow(e,2*x);
    }
    }
    else{
    for(int i=0; i<1000; i++) { 
                               

        x=log(d-sqrt(x));
                           }
    }
cout<<setprecision(9)<<x;
}

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