[2399] 거리의 차이

#include <cstdio>
 
#define MAX_SIZE 10000
#define ll long long
 
int n;
ll total;
int data[MAX_SIZE];
 
void input()
{
    scanf("%d", &n);
 
    for(int i = 0; i < n; i++)
    {
        scanf("%d", data + i);
        total += data[i];
    }
}
 
int abs(int a)
{
    if(a >= 0) return a;
    else return -a;
}
 
void solve()
{
    ll ret = 0;
 
    for(int i = 0; i < n; i++) 
    {
        for(int j = 0; j < n; j++)
        {
            ret += abs(data[i] - data[j]);
        }
    }
    printf("%lld\n", ret);
}
 
 
 
int main()
{
    input();
    solve();
 
    return 0;
}