UVA 10137 The Trip (ZOJ 1847, POJ 2646)

///     Raihan Ruhin
///     CSE, Jahangirnagar University.
///     Dhaka-Bangladesh.
///     id: raihanruhin (topcoder / codeforces / codechef / hackerrank / uva / uvalive / spoj), 3235 (lightoj)
///     mail: raihanruhin@ (yahoo / gmail / facebook)
///     blog: ruhinraihan.blogspot.com

#include<bits/stdc++.h>
using namespace std;

#define SET(a) memset(a,-1,sizeof(a))
#define CLR(a) memset(a,0,sizeof(a))
#define PI acos(-1.0)

#define MOD 1000000007
#define MX 100010


int main()
{
    ios_base::sync_with_stdio(0);cin.tie(0);
    int n, tc, kk=1;
    double arr[1005], avg, tot, ans1, ans2;
    string s;
    while(cin>>n && n)
    {
        tot=0;
        for(int i=0;i<n;i++)
        {
            cin>>arr[i];
            tot+=arr[i];
        }
        avg=tot/(double)n;
        ans1=ans2=0;
        //cout<<avg<<endl;

        for(int i=0;i<n;i++)
        {
            double dif = (double) (long long) ((arr[i]-avg)*100.0)/100.0 ;
            if(dif>0)
                ans1+=dif;
            else ans2-=dif;
        }

        tot=max(ans1, ans2);

        cout<<"$"<<setprecision(2)<<fixed<<tot<<"\n";
    }
return 0;
}