Submission #1111061

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Source Code Expand

#include<iostream>
#include<cstdio>
#include<vector>
#include<algorithm>
#include<map>
#include<string>
#include<cmath>
#include<numeric>
#include<queue>
using namespace std;



int main(void) {

  int n;
  cin >> n;
  vector<int> a(n);
  for(int i=0; i<n; i++) cin >> a[i];

  double ave = 0.0;
  for(int i=1; i<n; i++){
    ave += (a[i]-a[i-1]);
  }
  ave /= n-1;

  printf("%.5lf\n", ave);

  return 0;
}










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