学步园

题目描述

http://ac.jobdu.com/problem.php?pid=1541

直接模拟就好了，但是我的代码后面的样例要超时。。。不知道为什么，把cin , cout 改成 scanf 之后居然就变成 output limit exceed 了，奇怪。

算了，思路对的就行，懒得去搞了。

#include<iostream>
#include<cstdio>
#include<vector>
#include<string>
#include<cstring>
#include<climits>
#include<queue>
#include<map>
#include<algorithm>
using namespace std;

struct node
{
	int parent,left,right;
	int id,childsum;
	node():parent(-1),left(-1),right(-1),childsum(1){}
};
node tree[1005];

int calChildSum(int rt)
{
	if(rt==-1||tree[rt].childsum!=-1)
		return 0;
	int l=calChildSum(tree[rt].left);
	int r=calChildSum(tree[rt].right);
	tree[rt].childsum=l+r+1;
	return tree[rt].childsum;
}
int children(int rt)
{
	if(rt==-1)
		return 0;
	return tree[rt].childsum;
}
void push_up(int rt)
{
	if(rt==-1)
		return;
	tree[rt].childsum=1+children(tree[rt].left)+children(tree[rt].right);
}

void rotate(int rt)
{
	if(rt==-1||tree[rt].parent==-1)
		return;
	int p=tree[rt].parent;
	if ( rt==tree[p].left)
	{
		int r=tree[rt].right;
		tree[p].left=r;
		if(r!=-1)
			tree[r].parent=p;
		tree[rt].right=p;
	}
	else
	{
		int l=tree[rt].left;
		tree[p].right=l;
		if(l!=-1)
			tree[l].parent=p;
		tree[rt].left=p;
	}
	int pp=tree[p].parent;
	tree[p].parent=rt;
	tree[rt].parent=pp;
	if(pp!=-1&&tree[pp].left==p)
		tree[pp].left=rt;
	else if (pp!=-1&&tree[pp].right==p)
		tree[pp].right=rt;
	push_up(p);
	push_up(rt);
}

int main()
{
	int n;
	while(cin>>n)
	{
		for(int i=1;i<=n;i++)
		{
			tree[i].id=i;
			tree[i].left=tree[i].right=-1;
			tree[i].parent=-1;
			tree[i].childsum=-1;
		}
		for(int i=1;i<=n;i++)
		{
			tree[i].id=i;
			cin>>tree[i].left>>tree[i].right;
			if(tree[i].left!=-1)
				tree[tree[i].left].parent=i;
			if(tree[i].right!=-1)
				tree[tree[i].right].parent=i;
		}
		for(int i=1;i<=n;i++)
			calChildSum(i);
		int t;
		cin>>t;
		while(t--)
		{
			string op;
			int id;
			cin>>op>>id;
			if(op=="size")
				cout<<tree[id].childsum<<endl;
			else if (op=="rotate")
				rotate(id);
			else if (op=="parent")
				cout<<tree[id].parent<<endl;
		}
	}
}