集训第五周动态规划 K题 背包

#include"iostream"
#include"cstring"
using namespace std;
int a[101];
int book[10001],ans[10001];
int m,n;


void Work()
{
     for(int i=0;i<n;i++)
     for(int j=m;j>=a[i];j--)
     {
     book[j]=min(book[j],book[j-a[i]]); 
     }

     for(int i=0;i<n;i++)
     for(int j=0;j<=m-a[i];j++)
     {
     book[j]=min(book[j],book[j+a[i]]);  
     }

     int top=0;
     for(int i=1;i<=m;i++)
     if(book[i]==1) ans[top++]=i;

     cout<<top<<endl;
     if(top)
     {
     for(int j=0;j<top-1;j++) cout<<ans[j]<<" ";
     cout<<ans[top-1]<<endl;
     }
}

int main()
{
    while(cin>>n)
    {
     m=0;
     memset(book,0,sizeof(book));
     for(int i=0;i<n;i++)  {cin>>a[i];m+=a[i];}
     for(int j=1;j<=m;j++) book[j]=1;
     book[0]=0;
     Work();
    }
    return 0;
}