11389 - The Bus Driver Problem.cpp

#include<iostream>
#include<stdio.h>
#include<algorithm>
using namespace std;
int main()
{
    int n,d,r;
    while (scanf("%d %d %d", &n, &d, &r), n || d || r)
    {
        if(n==0 && d==0 && r==0)
            break;
        int m[100],e[100];
        int hours,ans=0;
        for(int i=0; i<n; i++)
            cin>>m[i];
        for(int i=0; i<n; i++)
            cin>>e[i];

        sort(m,m+n);
        sort(e,e+n,greater<int>());
        for(int i=0; i<n; i++)
        {
            hours=m[i]+e[i];
            if(hours>d)
                ans+=(hours-d)*r;
        }
        cout<<ans<<endl;
    }
    return 0;
}