判断B树是否是A的子树

#include <iostream>
#include <cstdio>
#include <cstring>
#include <stdlib.h>
using namespace std;
#define M 1001
typedef struct Tree
{
    int data;
    struct Tree *lson,*rson;
} TNode,*ListTree;

ListTree built(int n)
{
    int val;
    ListTree point[M];
    memset(point,NULL,sizeof(point));
    for(int i=1; i<=n; i++)
    {
        scanf("%d",&val);
        point[i]=(ListTree)malloc(sizeof(TNode));
        point[i]->data=val;
        point[i]->lson=NULL;
        point[i]->rson=NULL;
    }

    for(int i=1; i<=n; i++)
    {
        int k;
        scanf("%d",&k);

        for(int j=0; j<k; j++)
        {
            int tmp;
            scanf("%d",&tmp);
            if(j==0)
                point[i]->lson=point[tmp];
            if(j==1)
                point[i]->rson=point[tmp];
        }
    }
    return point[1];
}
void output(ListTree root)//前序遍历
{
    if(root!=NULL)
    {
        cout<<root->data<<" ";
        output(root->lson);
        output(root->rson);
    }
}
bool judge(ListTree ra,ListTree rb)//验证rb是不是ra的子树
{
    if(rb==NULL)
        return true;
    if(ra==NULL)
        return false;
    if(ra->data!=rb->data)
        return false;
    return judge(ra->lson,rb->lson)&&judge(ra->rson,rb->rson);
}
bool solve(ListTree ra,ListTree rb)//在ra中与rb根节点相同
{
    bool ans=false;
    if(ra!=NULL&&rb!=NULL)
    {
        if(ra->data==rb->data)
            ans=judge(ra,rb);
        if(!ans)
            ans=solve(ra->lson,rb);
        if(!ans)
            ans=solve(ra->rson,rb);
    }
    return ans;
}
int main()
{
    int n,m;
    while(scanf("%d %d",&n,&m)!=EOF)
    {
        ListTree roota=built(n);
        ListTree rootb=built(m);
        if(m==0)
        {
            printf("NO\n");
            continue;
        }
        bool result=solve(roota,rootb);
        if(result)
            printf("YES\n");
        else
            printf("NO\n");
    }
    return 0;
}