HDU - 1789 Doing Homework again

3
3
3 3 3
10 5 1
3
1 3 1
6 2 3
7
1 4 6 4 2 4 3
3 2 1 7 6 5 4

Sample Output

0
3
5

题意：每个作业都有规定要完成的时间，和超时的扣分，求最小的扣分

思路：贪心排序，然后每个都从最远的时间开始做，标记处理

#include <iostream>
#include <cstdio>
#include <cstring>
#include <algorithm>
using namespace std;
const int maxn = 1005;

struct Node {
	int day, cost;
} node[maxn];
int n;
int f[maxn];

int cmp(Node a, Node b) {
	return a.cost < b.cost;
}

int main() {
	int t;
	scanf("%d", &t);
	while (t--) {
		scanf("%d", &n);		
		for (int i = 0; i < n; i++) {
			scanf("%d", &node[i].day);
			if (node[i].day > n)
				node[i].day = n;
		}
		int sum = 0;
		for (int i = 0; i < n; i++) {
			scanf("%d", &node[i].cost);
			sum += node[i].cost;
		}
		sort(node, node+n, cmp);
		memset(f, 0, sizeof(f));
		for (int i = n-1; i >= 0; i--) 
			for (int j = node[i].day; j >= 1; j--) 
				if (!f[j]) {
					f[j] = 1;
					sum -= node[i].cost;
					break;
				}
		printf("%d\n", sum);
	}
	return 0;
}

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HDU - 1789 Doing Homework again

原文：http://blog.csdn.net/u011345136/article/details/38226795