把下午的时间和晚上的时间分别正序排序和逆序排序。。
/***********************************************
* Author: fisty
* Created Time: 2015/2/10 14:49:31
* File Name : uva11389.cpp
*********************************************** */
#include <iostream>
#include <cstring>
#include <deque>
#include <cmath>
#include <queue>
#include <stack>
#include <list>
#include <map>
#include <set>
#include <string>
#include <vector>
#include <cstdio>
#include <bitset>
#include <algorithm>
using namespace std;
#define Debug(x) cout << #x << " " << x <<endl
#define Memset(x, a) memset(x, a, sizeof(x))
const int INF = 0x3f3f3f3f;
typedef long long LL;
typedef pair<int, int> P;
#define FOR(i, a, b) for(int i = a;i < b; i++)
#define MAX_N 110
int n, d, r;
int afternoon[MAX_N], evening[MAX_N];
int ans[MAX_N];
bool cmp(int a, int b){
return a > b;
}
int main() {
//freopen("in.cpp", "r", stdin);
cin.tie(0);
ios::sync_with_stdio(false);
while(cin >> n >> d >> r){
if(!n && !d && !r) break;
FOR(i, 0 , n){
cin >> afternoon[i];
}
FOR(i, 0, n){
cin >> evening[i];
}
sort(afternoon, afternoon + n);
sort(evening, evening + n, cmp);
int ans = 0;
for(int i = 0;i < n; i++){
if(afternoon[i] + evening[i] > d){
ans += r*(afternoon[i] + evening[i] - d);
}
}
cout << ans << endl;
}
return 0;
}