hdu-2546 饭卡

http://acm.hdu.edu.cn/showproblem.php?pid=254
0-1背包问题
代码:
#include<stdio.h>
#include<string.h>
#include<algorithm>
using namespace std;
int cmp(int a,int b){
	return a<b;
}
int main(){
	int n;
	int price[1200],dp[1200];
	int i,j,k,t,m;
	while(~scanf("%d",&n),n){
		memset(price,0,sizeof(price));
		memset(dp,0,sizeof(dp));
		for(i=0;i<n;i++)
		  scanf("%d",&price[i]);
		scanf("%d",&m);
		sort(price,price+n,cmp);
		if(m<5){
			printf("%d\n",m);
			continue;
		}
		m-=5;
		for(i=0;i<n-1;i++){
			for(j=m;j>=price[i];j--)
			  dp[j]=max(dp[j],dp[j-price[i]]+price[i]);
		}
	//	printf("%d\n",dp[n-1]);
		printf("%d\n",m+5-dp[m]-price[n-1]);
	}
	return 0;
}

6

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