• Binary search tree


    //二叉查找树的实现
    #include <cstdio>
    #include <cstdlib>
    //#define _OJ_
    
    typedef struct tree1
    {
        int data;
        struct tree1 *lchild;
        struct tree1 *rchild;
    } tree1, *tree;
    
    tree
    find(int x, tree T)
    {
        if(T == NULL)
            return NULL;
        if(x < T->data)
            find(x, T->lchild);
        else
        if(x > T->data)
            find(x, T->rchild);
        else
            return T;
    }
    
    tree
    find_min(tree T)
    {
    
        // printf("fsaf
    ");
        if(T == NULL)
            return NULL;
        else
            if(T->lchild == NULL)
                return T;
        else
            find_min(T->lchild);
    }
    
    tree
    find_max(tree T)
    {
        if(T != NULL)
            while(T->rchild != NULL)
                find_max(T->rchild);
         return T;
    }
    
    tree
    insert(int x, tree T)
    {
        // printf("dfsad
    ");
        if(T == NULL)
        {
         T = (tree) malloc (sizeof(tree1));
         T->data = x;
         T->lchild = T->rchild = NULL;
        }
        else
        if(x < T->data)
            T->lchild = insert(x,T->lchild);
        else
        if(x > T->data)
            T->rchild = insert(x,T->rchild);
        return T;
    }
    
    
    tree
    del_tree(int x, tree T)
    {//找出右子树最小的代替要删除的节点,再删除最小的那个节点!!!
        tree tmp;
        if(T == NULL)
            return NULL;
        else
            if(x < T->data)
                T->lchild = del_tree(x,T->lchild);
        else
            if(x > T->data)
                T->rchild = del_tree(x,T->lchild);
        else                                     //find element to del_tree
            if(T->lchild && T->rchild)//two children
            {
            tmp = find_min(T);
            T->data = tmp->data;
            T->rchild = del_tree(T->data, T->rchild);
            }
            else    //one or zero child
            {
            tmp = T;
            if(T->lchild == NULL)
                T = T->rchild;
            else if(T->rchild == NULL)
                T = T->lchild;printf("%p
    ", T);
                // free(tmp);
            }
            return T;
    }
    
    int main(int argc, char const *argv[]) {
    #ifndef _OJ_  //ONLINE_JUDGE
        freopen("input.txt", "r", stdin);
    #endif
        int i,n;
        int a[10];
        tree T = NULL;
        tree T1 = NULL;
        tree T2 = NULL;
        scanf("%d", &n);
        for(i = 0;i < n; i++)
        {
        scanf("%d", &a[i]);
        printf("%d
    ", a[i]);
        }
        T = insert(a[0], T);
        printf("T == %p
    ", T);
        insert(a[1],T);
    
        T1 = find_min(T);
        printf("T! == %p
    ", T1);
        printf("%d
    ", T1->data);
        del_tree(0,T);
        printf("%p
    ", T->lchild);
        T2 = find_min(T);
        printf("%d
    ", T2->data);
        return 0;
    }
    

     

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  • 原文地址:https://www.cnblogs.com/airfand/p/4987545.html
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