题1020 40min 注意new node 必须写 申请地址空间

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#include <cstdio>
#include <cstring>
#include <algorithm>
#include <queue>
using namespace std;
const int maxn = 40;
int n;
int post[maxn],in[maxn];
struct Node{
	struct Node * lchild,*rchild;
	int data;
};
Node * create(int pl,int pr,int il,int ir)
{
	if(pr < pl) return NULL;
	Node * root = new Node;
	root->data = post[pr];
	int k;
	for(k = il; k <= ir; k++)
	{
		if(in[k] == post[pr])
		   break;
	}
	root->lchild = create(pl,pl+k-il-1,il,k-1);
	root->rchild = create(pl+k-il,pr-1,k+1,ir);
	return root;
}

void bfs(Node * root)
{
	queue <Node*> q;
	q.push(root);
	while(!q.empty())
	{
        Node * temp = q.front();
		q.pop();
		if(temp != root) printf(" ");
		printf("%d",temp->data);
	
		if(temp->lchild != NULL) q.push(temp->lchild);
		if(temp->rchild != NULL) q.push(temp->rchild);
	} 
}
int main()
{
	scanf("%d",&n);
	for(int i = 0; i < n; i++){
		scanf("%d",&post[i]);
	}
	for(int i = 0; i < n ; i++){
		scanf("%d",&in[i]);
	}
	Node * root = NULL;
	root = create(0,n-1,0,n-1);
	bfs(root);
	return 0;
} 

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转载自blog.csdn.net/Coding18/article/details/86011889