提出 #228678

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ソースコード 拡げる

#include<bits/stdc++.h>
using namespace std;
double d;
int main() {
  cin >> d;
  double res =d >= 1.0 ? (double)((int)d + 1.0) : 0.0;
  /*  for(int i=0;i<=10;i++){
    if( (double)i > d ) break;
    
    double st= 0.0,ed= 100.0,h;
    for(int j=0;j<100;j++){
      h = (st+ed)/2;
      if( sqrt( (double)(i * i) + h * h ) > d ) {
	ed = h;
      } else                                                                          
	st = h;
    }
    cout << h << endl;
    //cout<<sqrt(d*d-(double)(i*i)) + (double)i <<endl;
    //res = max( res, sqrt(d*d-(double)(i*i)) + (double)i );
    res = max( res, h + (double)i );
  }
  */
    double st= 0.0,ed= 100.0,h;
    for(int j=0;j<100;j++){
      h = (st+ed)/2;
      if( sqrt( h * h + h * h ) > d ) {
	ed = h;
      } else                                                                          
	st = h;
    }
    res = max( res, h+h );
      //    cout << "45:   " << h << " " <<h+h<< endl;
    

  printf("%.10lf\n",res);
}

提出情報

ジャッジ結果