Submission #18304

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Source Code Expand

#include <iostream>
#include <vector>
#include <cstdio>
#include <string>
#include <algorithm>
#include <numeric>
#include <map>

using namespace::std;



int main(void){

  int N;
  string rs;
  string ind="FDCBA";

  cin >> N;

  cin >> rs;

  int temp;
  double sum = 0;

  for(int i = 0 ; i < 5; i++)
    {
      temp = (double)count(rs.begin(),rs.end(),ind[i]);
      sum += temp * i;
    }
  printf("%.10lf\n",sum/N);


  return 0;
}

Submission Info

Judge Result