【数据结构上机练习】考试题目 3

代码：

#include <iostream>
#include<stack>
#include<queue>
#include<cstdio>
#include<cstring>
using namespace std;


typedef struct  Node{
    char data;
    int le;
    Node * left,*right;
    Node(){le=0;}
}BinTreeNode;

class BinTree{
private:
    BinTreeNode *root;
    int maxle;
public:
    BinTree(){
        cout<<"输入要创建的树，空节点用#代替\n";
        root = creat();
        root->le=0;
        maxle=0;
}
    BinTree(BinTreeNode & temp){
        root = &temp;
        temp.left = NULL;
        temp.right = NULL;
    }
    BinTreeNode * getRoot(){
        return root;
    }
    BinTreeNode * creat(){ //递归创建树
        char t;
        cin>>t;
        if(t=='#'){// #  stand for null
            return NULL;
        }
        else{
            BinTreeNode *r = new BinTreeNode;
            r->data = t;
            r->left = creat();
            r->right = creat();
            return r;
        }
    }
    void dfs(BinTreeNode *x){
        if(x){
            if(maxle<x->le) maxle=x->le;
            if(x->left)x->left->le=x->le+1;
        if(x->right)x->right->le=x->le+1;
        dfs(x->left);dfs(x->right);
        }
    }
    void dfs(){dfs(root);}
    void dfs2(int *k,BinTreeNode *x)
    {
        if(x){
        if(x->left==0&&x->right==0)k[x->le]++;
        dfs2(k,x->left);
        dfs2(k,x->right);
        }
    }

    void leaf()
    {
        dfs();
        int num[100]={};
        dfs2(num,root);
        for(int i=0;i<=maxle;++i)
            printf("第%d层包含%d个叶结点.\n",i,num[i]);
    }

};

int main(){

    // 测试数据 （教材87页图）   *+A##B##+*-C##D##E##F##



        BinTree mb;
        //BinTreeNode *r = mb.getRoot();
        mb.leaf();

    return 0;
}

运行结果：