POJ 1949 Chores

http://poj.org/problem?id=1949

一句话破题，“Farmer John's list of chores is nicely ordered, and chore K (K > 1) can have only chores 1,.K-1 as prerequisites.”

#include <iostream>
using namespace std ;
int dp[10001] ;
int main()
{
    int n ;
    while(~scanf("%d",&n))
    {
        int w,k,maxx ;
        int ans=0 ;
        for(int i=1;i<=n;i++)
        {
            scanf("%d%d",&w,&k) ;
            maxx=0 ;
            while(k--)
            {
                int p ;
                scanf("%d",&p) ;
                maxx=max(maxx,dp[p]) ;
            }
            dp[i]=w+maxx ;
            ans=max(ans,dp[i]) ;
        }
        printf("%d\n",ans) ;    
    }
    return 0 ;
}