Problem:
Score : 200 points

Problem Statement

Niwango-kun is an employee of Dwango Co., Ltd.

One day, he is asked to generate a thumbnail from a video a user submitted.

To generate a thumbnail, he needs to select a frame of the video according to the following procedure:

Get an integer N and N integers a_0, a_1, ..., a_{N-1} as inputs. N denotes the number of the frames of the video, and each a_i denotes the representation of the i-th frame of the video.

Select t-th frame whose representation a_t is nearest to the average of all frame representations.

If there are multiple such frames, select the frame with the smallest index.

Find the index t of the frame he should select to generate a thumbnail.

Constraints

1 \leq N \leq 100

1 \leq a_i \leq 100

All numbers given in input are integers

Input

Input is given from Standard Input in the following format:

N
a_{0} a_{1} ... a_{N-1}

Output

Print the answer.

Sample Input 1

3
1 2 3

Sample Output 1

1

Since the average of frame representations is 2, Niwango-kun needs to select the index 1, whose representation is 2, that is, the nearest value to the average.

Sample Input 2

4
2 5 2 5

Sample Output 2

0

The average of frame representations is 3.5.

In this case, every frame has the same distance from its representation to the average.

Therefore, Niwango-kun should select index 0, the smallest index among them.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
#define mod 1000000007
 
int gcd(int a, int b) { return b ? gcd(b, a%b) : a; }
 
int lcm(int a, int b) { return a * b / gcd(a, b); }

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

    ll ave = 0;
    for(int i = 0; i < n; i++){
        a[i] *= n;
        ave += a[i];
    }
    ave /= n;

    ll ans_min = 0;
    for(int i = 1; i < n; i++){
        if(abs(a[i] - ave) < abs(a[ans_min] - ave)){
            ans_min = i;
        }
    }
    cout << ans_min << endl;
    return 0;
}