I NEED A OFFER!

10 3
4 0.1
4 0.2
5 0.3
0 0

44.0%

Hint
You should use printf("%%") to print a ‘%‘.
 

#include <stdio.h>
#include <algorithm>
#define maxn 10002
using namespace std;

struct Node{
	int w;
	double v, pos;
} arr[maxn];

bool cmp(Node a, Node b){
	return a.pos > b.pos;
}

int main()
{
	int n, m, i;
	double ans;
	while(scanf("%d%d", &n, &m), n || m){
		for(i = 0; i < m; ++i){
			scanf("%d%lf", &arr[i].w, &arr[i].v);
			arr[i].pos = arr[i].v / arr[i].w;
		}
		sort(arr, arr + m, cmp);
		ans = 1;
		for(i = 0; i < m; ++i){
			if(n >= arr[i].w){
				n -= arr[i].w;
				ans *= (1.0 - arr[i].v);
			}else break;
		}
		printf("%.1lf%%\n", 100.0 * (1 - ans));
	}
	return 0;
}

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HDU1203 I NEED A OFFER! 【贪心】

原文：http://blog.csdn.net/chang_mu/article/details/38541047