HDU 3661 Assignments

于PAT/ACM培训的报名通知~

Assignments

Time Limit: 4000/2000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 1075    Accepted Submission(s): 488

Problem Description

In a factory, there are N workers to finish two types of tasks (A and B). Each type has N tasks. Each task of type A needs xi time to finish, and each task of type B needs yj time to finish, now, you, as the boss of the factory, need to make an assignment, which makes sure that every worker could get two tasks, one in type A and one in type B, and, what's more, every worker should have task to work with and every task has to be assigned. However, you need to pay extra money to workers who work over the standard working hours, according to the company's rule. The calculation method is described as follow: if someone’ working hour t is more than the standard working hour T, you should pay t-T to him. As a thrifty boss, you want know the minimum total of overtime pay.

 

Input

There are multiple test cases, in each test case there are 3 lines. First line there are two positive Integers, N (N<=1000) and T (T<=1000), indicating N workers, N task-A and N task-B, standard working hour T. Each of the next two lines has N positive Integers; the first line indicates the needed time for task A1, A2…An (Ai<=1000), and the second line is for B1, B2…Bn (Bi<=1000).

 

Output

For each test case output the minimum Overtime wages by an integer in one line.

 

Sample Input

2 5 4 2 3 5

 

Sample Output

4

 

Source

2010 Asia Regional Harbin

 

Recommend

lcy

 //贪心题目，算是比较代码比较简单的了、刚开始看后我还真不会做、郁闷，其实就是尽可能把每个工人都把限定的时间用完了去，一个升序、一个降序、开始也不理解为什么这样就是对的了，貌似这样会让浪费尽可能小

#include <iostream>
#include <stdio.h>
#include <string.h>
#include <algorithm>
#include <cmath>
#define Y 1003
using namespace std;
bool cmp(const int&a,const int&b)
{
    return a>b;
}
int main()
{
    int a[Y],b[Y];
    int N,T;
    int sum;
    while(scanf("%d%d",&N,&T)!=EOF)
    {   int i;
        for(i=0;i<N;i++)
         scanf("%d",&a[i]);
        for(i=0;i<N;i++)
         scanf("%d",&b[i]);
        sort(a,a+N);
        sort(b,b+N,cmp);
        for(sum=i=0;i<N;i++)
         if(a[i]+b[i]>T)
          sum+=a[i]+b[i]-T;
        printf("%d\n",sum);
    }
    return 0;
}