#include<stdio.h>
#include<stdlib.h>
#define max(a,b) a>b? a:b
int save[6002],save2[6001];
int boss[6002], l[6002],r[6002],mark[6002],v[6002],used[6002];
long p[6002][2];
int top;
int solve()
{
    int i,j,k,c;
    int x=0,y;
    if(!save[1])return 0;
    for(y=1;save[y];y++)
    {
        i=save[y];
        if(!used[i])
        {
        p[i][1]=v[i];
        p[i][1]+=p[l[i]][0];
        c=r[l[i]];
        while(c)
        {
            p[i][1]+=p[c][0];
            c=r[c];
        }
        p[i][0]=max(p[l[i]][0],p[l[i]][1]);
        c=r[l[i]];
        while(c)
        {
            p[i][0]+=max(p[c][0],p[c][1]);
            c=r[c];
        }
        save2[++x]=boss[i];
        used[i]=1;
        }

    }
    for(i=1;save[i];i++)
    {
        save[i]=save2[i];
    }
    solve();
    return 0;
}


int main()
{
    int i, j,k;
    int x,y;
    int num;
    scanf("%d",&num);
    for(i=1;i<=num;i++)
        scanf("%d",&v[i]);
    while(scanf("%d%d",&x,&y)==2)
    {
        if(!x)break;
        boss[x]=y;
        if(l[y])
        {
            r[l[y]]=x;mark[y]=x;
        }
        else
        {
            l[y]=x;mark[y]=x;
        }
    }
    for(i=1;i<=num;i++)
        if(!boss[i])break;
        top=i;
        j=0;
    for(i=1;i<=num;i++)
        if(!l[i])
        {
            save[++j]=boss[i];
            p[i][0]=0;
            p[i][1]=v[i];
        }
        solve();
        printf("%ld\n",max(p[top][1],p[top][0]));
    //    system("pause");
        return 0;
}

Can 2 poeple supervise 1 person?

I find a mistake yet, so careless~~
a subscrib was miswritten~~~