九度OJ 1503:二叉搜索树与双向链表




#include<iostream>
#include<cstdio>
#include<cstring>
#include<algorithm>
#include<vector>
#include<cmath>
#include<map>
#include<string>
#include<set>
#include<queue>
using namespace std;
typedef long long LL;
const int INF=0x7f7f7f7f;
const int inf=0x80808080;
struct TreeNode
{
    int val;
    TreeNode *left,*right;
    TreeNode(int x):val(x),left(NULL),right(NULL) {}
};
void read(TreeNode **node)
{
    int x;
    scanf("%d",&x);
    if(x==0) *node=NULL;
    else
    {
        *node=new TreeNode(x);
        read(&(*node)->left);
        read(&(*node)->right);
    }
}

void GetSortedList(TreeNode *node,TreeNode **beg,TreeNode **end)
{
    if(node->left==NULL&&node->right==NULL)
        *beg=node,*end=node;
    else
    {
        TreeNode *begL=NULL,*endL=NULL;
        if(node->left!=NULL)
        {
            GetSortedList(node->left,&begL,&endL);
            endL->right=node;
            node->left=endL;
            *beg=begL;
        }
        else *beg=node;
        TreeNode *begR=NULL,*endR=NULL;
        if(node->right!=NULL)
        {
            GetSortedList(node->right,&begR,&endR);
            begR->left=node;
            node->right=begR;
            *end=endR;
        }
        else *end=node;

    }
}
TreeNode* TreeToSortedList(TreeNode *root)
{
    if(root==NULL) return NULL;
    TreeNode *beg=NULL,*end=NULL;
    GetSortedList(root,&beg,&end);
    return beg;
}
void out(TreeNode *root)
{
    while(root!=NULL)
    {
        printf("%d ",root->val);
        root=root->right;
    }
}
void erase(TreeNode *node)
{
    while(node!=NULL)
    {
        TreeNode *temp=node;
        node=node->right;
        delete temp;
    }
}
int main()
{
    int n;
    scanf("%d",&n);
    while(n--)
    {
        TreeNode *root;
        read(&root);
        TreeNode *newroot=TreeToSortedList(root);
        out(newroot);
        printf("\n");
        erase(root);
    }
    return 0;
}


你可能感兴趣的:(九度OJ 1503:二叉搜索树与双向链表)