01背包饭卡

https://vjudge.net/contest/150953#problem/B

转化一下就行了，<5时要特判

#include<map>
#include<set>
#include<list>
#include<cmath>
#include<queue>
#include<stack>
#include<vector>
#include<cstdio>
#include<cstring>
#include<iostream>
#include<algorithm>
#define ll long long

using namespace std;

const int maxn=600,N=1005;

int main()
{
    int t,n,W,v[N],dp[N];
    while(cin>>n,n){
        memset(dp,0,sizeof(dp));
        for(int i=0;i<n;i++)cin>>v[i];
        cin>>W;
        sort(v,v+n);
        if(W<5)
        {
            cout<<W<<endl;
            continue;
        }
        for(int i=0;i<n-1;i++)
            for(int j=W-5;j>=v[i];j--)
                dp[j]=max(dp[j],dp[j-v[i]]+v[i]);
        cout<<W-dp[W-5]-v[n-1]<<endl;
    }
    return 0;
}