In a city there are n bus drivers. Also there are n morning bus routes & n afternoon bus routes with various lengths. Each driver is assigned one morning route & one evening route. For any driver, if his total route length for a day exceeds d, he has to be paid overtime for every hour after the first d hours at a flat r taka / hour. Your task is to assign one morning route & one evening route to each bus driver so that the total overtime amount that the authority has to pay is minimized. Input The first line of each test case has three integers n, d and r, as described above. In the second line, there are n space separated integers which are the lengths of the morning routes given in meters. Similarly the third line has n space separated integers denoting the evening route lengths. The lengths are positive integers less than or equal to 10000. The end of input is denoted by a case with three 0 s. Output For each test case, print the minimum possible overtime amount that the authority must pay. Constraints -           1 ≤ n ≤ 100 -           1 ≤ d ≤ 10000 -           1 ≤ r ≤ 5 Sample Input Output for Sample Input 2 20 5 10 15 10 15 2 20 5 10 10 10 10 0 0 0 50 0

Their thinking ： The meaning of this topic is how to allocate to minimize the overtime pay of bus drivers ,n A driver , In the morning n Paths , Every way is x length , At night n Paths , Each path is X length ,d It means the fixed length of a driver's day ,r It means the price , Every time more than y Length , Then the driver can get y*r Overtime pay .

To minimize overtime pay , You need to sort the length you run in the morning and the length you run in the afternoon , From small to large , One from big to small , In this way, the sum of the two can be minimized , So overtime pay will be kept to a minimum .

Program code ：

``` #include <iostream>
#include <algorithm>
#include <cstdio>
using namespace std;
const int m=+;
int a[m],b[m];
bool p(int a,int b)
{ return a>b;}
inline int max(int a,int b)
{
return a>b?a:b;
}
int main()
{int n,d,r,i;
while(cin>>n>>d>>r&&(n!=&&d!=&&r!=))
{
for(i=;i<n;i++)
scanf("%d",&a[i]);
for(i=;i<n;i++)
scanf("%d",&b[i]);
sort(a,a+n);
sort(b,b+n,p);
int sum=;
for(i=;i<n;i++)
sum+=max(,(a[i]+b[i]-d));
cout<<sum*r<<endl;
}
return ;
}```

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