BZOJ 1606: [Usaco2008 Dec]Hay For Sale 购买干草

1606: [Usaco2008 Dec]Hay For Sale 购买干草

Description

约翰遭受了重大的损失：蟑螂吃掉了他所有的干草，留下一群饥饿的牛．他乘着容量为C(1≤C≤50000)个单位的马车，去顿因家买一些干草．顿因有H(1≤H≤5000)包干草，每一包都有它的体积Vi(l≤Vi≤C).约翰只能整包购买，

他最多可以运回多少体积的干草呢？

Input

第1行输入C和H，之后H行一行输入一个Vi．

Output

最多的可买干草体积．

Sample Input

7 3 //总体积为7,用3个物品来背包
2
6
5

The wagon holds 7 volumetric units; three bales are offered for sale with
volumes of 2, 6, and 5 units, respectively.

Sample Output

7 //最大可以背出来的体积

——我是华丽的分割线——

一个安静的背包DP.....

代码：

#include<cstdio>
using namespace std;
int c,h;
int v[5010];
bool f[50010];
int main(){scanf("%d%d",&c,&h);for (int i=1;i<=h;i++) scanf("%d",&v[i]);f[0]=true;for (int i=1;i<=h;i++){for (int j=c;j>=v[i];j--){if (f[j-v[i]]) f[j]=true;}}for (int i=c;i>=0;i--){if (f[i]){printf("%d\n",i);return 0;}}return 0;
}

转载于:https://www.cnblogs.com/WNJXYK/p/4063957.html

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