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struct bitree
{
    int data;
    struct bitree *left;
    struct bitree *right;
};
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struct binary_tree_s {
    void                    *data;
    struct binary_tree_s    *left_son;
    struct binary_tree_s    *right_son;
    struct binary_tree_s    *link;          //¶à¶¨ÒåÒ»¸öÓò£¬Éú³ÉÊ÷ʱ¸´ÖÆΪ0£¬Õâ
ÑùÊÇ·ñÊʺÏÄãµÄ¿Õ¼äÒªÇó
};

void output_data(void *data) {}

void post_order(struct binary_tree_s *binary_tree)
{
    struct binary_tree_s *p, *q;

    if (binary_tree) {
        p = binary_tree;
        while (1) {
            if (p->left_son) {
                if (!p->left_son->link) {     //ÒÔ´ËÀ´ÅжÏ×ó×ÓÊ÷ÊÇ·ñ±»·ÃÎʹý
                    p->left_son->link = p;
                    p = p->left_son;
                    continue;
                }
            }
            if (p->right_son) {
                if (!p->right_son->link) {     //ÒÔ´ËÀ´ÅжÏÓÒ×ÓÊ÷ÊÇ·ñ±»·ÃÎʹý
                    p->right_son->link = p;
                    p = p->right_son;
                    continue;
                }
            }
            output_data(p->data);             //Êä³ö½ÚµãÐÅÏ¢
            if (p == binary_tree) {           //ÅжÏÊÇ·ñÒѾ­µ½´ï¸ù½Úµã
                break;
            }
            q = p;
            p = p->link;
            q->link = (struct binary_tree_s *)~0L;          //½«Æ临ÖÆΪÎÞЧֵ
        }
    }
}

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¡ù À´Ô´:£®¹þ¹¤´ó×϶¡Ïã bbs.hit.edu.cn [FROM: 219.133.122.170]

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struct binary_tree_s {
    void                    *data;

    struct binary_tree_s    *link;
    struct binary_tree_s    *left_son;
    struct binary_tree_s    *right_son;
};

void output_data(void *data) {printf("data = %p\n", data);}

void post_order(struct binary_tree_s *binary_tree)
{
    struct binary_tree_s *p, *q;

    if (binary_tree) {
        p = binary_tree;
        while (1) {
            if (p->left_son) {
                if (!p->left_son->link) {
                    p->left_son->link = p;
                    p = p->left_son;
                    continue;
                }
            }
            if (p->right_son) {
                if (!p->right_son->link) {
                    p->right_son->link = p;
                    p = p->right_son;
                    continue;
                }
            }
            output_data(p->data);
            if (p->left_son) {
                p->left_son->link = 0;
            }
            if (p->right_son) {
                p->right_son->link = 0;
            }
            if (p == binary_tree) {
                break;
            }
            q = p;
            p = p->link;
            q->link = (struct binary_tree_s *)~0L;
        }
    }
}
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: struct binary_tree_s {
:     void                    *data;
:     struct binary_tree_s    *left_son;
:     struct binary_tree_s    *right_son;
:     struct binary_tree_s    *link;          //¶à¶¨ÒåÒ»¸öÓò£¬Éú³ÉÊ÷ʱ¸´ÖÆΪ..
: ÑùÊÇ·ñÊʺÏÄãµÄ¿Õ¼äÒªÇó
: };

: void output_data(void *data) {}

: void post_order(struct binary_tree_s *binary_tree)
: {
:     struct binary_tree_s *p, *q;

:     if (binary_tree) {
:         p = binary_tree;
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: struct binary_tree_s {
:     void                    *data;

:     struct binary_tree_s    *link;
:     struct binary_tree_s    *left_son;
:     struct binary_tree_s    *right_son;
: };

: void output_data(void *data) {printf("data = %p\n", data);}

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typedef struct bitree /*¶þ²æÊ÷½áµã¶¨Òå*/ 
{
    int data;
    struct bitree *left;
    struct bitree *right;
}BiTreeNode,*BiTree;
void PostOrder(BiTree bt) /*??ºóÐò·ÇµÝ¹é±éÀú¶þ²æÊ÷*/
{
    BiTree p;
    Stack s1,s2; /*¶¨ÒåÁ½¸ö¿ÕÕ»*/
    p=bt;
    if(!bt) return;
    while(p)
    {
        Push(s2,p); /*Ö¸ÕëpѹÈëÕ»s2*/
        if(p->left)
            Push(s1,p->left); /*Ö¸Õëp->leftѹÈëÕ»s1*/
        p=p->right;
        if(!p) p=Pop(s1); /*s1ÍËÕ»*/
    }
    while(p=Pop(s2)) 
        printf("%d\t",p->data);
}
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struct binary_tree_s {
    void                    *data;
    struct binary_tree_s    *link;
    struct binary_tree_s    *left_son;
    struct binary_tree_s    *right_son;
};

void output_data(void *data) {printf("node = %p \n", data);}

1£¬Ïȸù
void prev_order(struct binary_tree_s *binary_tree)
{
    struct binary_tree_s *p, *q;

    if (binary_tree) {
        p = binary_tree;
        output_data(p->data);
        while(1) {
            if (p->left_son) {
                if (!p->left_son->link) {
                    p->left_son->link = p;
                    p = p->left_son;
                    output_data(p->data);
                    continue;
                }
            }
            if (p->right_son) {
                if (!p->right_son->link) {
                    p->right_son->link = p;
                    p = p->right_son;
                    output_data(p->data);
                    continue;
                }
            }
            if (p->left_son) {
                p->left_son->link = 0;
            }
            if (p->right_son) {
                p->right_son->link = 0;
            }
            if (p == binary_tree) {
                break;
            }
            q = p;
            p = p->link;
            q->link = (struct binary_tree_s *)~0L;
        }
    }
}

2£¬Öиù
void midl_order(struct binary_tree_s *binary_tree)
{
    struct binary_tree_s *p, *q;

    if (binary_tree) {
        p = binary_tree;
        while(1) {
            if (p->left_son) {
                if (!p->left_son->link) {
                    p->left_son->link = p;
                    p = p->left_son;
                    continue;
                }
            }
            if (!p->right_son || !p->right_son->link) {
                output_data(p->data);
            }
            if (p->right_son) {
                if (!p->right_son->link) {
                    p->right_son->link = p;
                    p = p->right_son;
                    continue;
                }
            }
            if (p->left_son) {
                p->left_son->link = 0;
            }
            if (p->right_son) {
                p->right_son->link = 0;
            }
            if (p == binary_tree) {
                break;
            }
            q = p;
            p = p->link;
            q->link = (struct binary_tree_s *)~0L;
        }
    }
}

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: typedef struct bitree /*¶þ²æÊ÷½áµã¶¨Òå*/ 
: {
:     int data;
:     struct bitree *left;
:     struct bitree *right;
: }BiTreeNode,*BiTree;
: void PostOrder(BiTree bt) /*??ºóÐò·ÇµÝ¹é±éÀú¶þ²æÊ÷*/
: {
:     BiTree p;
:     Stack s1,s2; /*¶¨ÒåÁ½¸ö¿ÕÕ»*/
:     p=bt;
:     if(!bt) return;
:     while(p)
:     {
:         Push(s2,p); /*Ö¸ÕëpѹÈëÕ»s2*/
:         if(p->left)
:             Push(s1,p->left); /*Ö¸Õëp->leftѹÈëÕ»s1*/
: (ÒÔÏÂÒýÑÔÊ¡ÂÔ...)

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: struct binary_tree_s {
:     void                    *data;
:     struct binary_tree_s    *link;
:     struct binary_tree_s    *left_son;
:     struct binary_tree_s    *right_son;
: };

: void output_data(void *data) {printf("node = %p \n", data);}


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