Submission #1370243

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Source Code Expand

#include <iostream>
#include <algorithm>
#include <vector>
#include <cstdio>
using namespace std;
double ans;
int n;

void coin(int *v){
  for(int i=0;i<n;i++){
    int tar=v[i];
    int s=0;
    for(int j=0;j<n;j++){
      if(i==j)continue;
      if(v[i]%v[j]==0)s++;
    }
    if(s%2==0)ans+=(double)(s+2.0)/(double)(2.0*s+2.0);
    else ans+=0.5;
  }
}

int main(){
  int v[101];
  cin >> n;
  for(int i=0;i<n;i++){
    cin >> v[i];
  }
  sort(v,v+n);
  coin(v);
  printf("%.6f\n",ans);
  return 0;
}

Submission Info

Judge Result