【C++】满二叉树问题

/*
给出一棵满二叉树的先序遍历，有两种节点：字母节点（A-Z，无重复）和空节点（#）。要求这个树的中序遍历。输出中序遍历时不需要输出#。
满二叉树的层数n满足1<=n<=5。

Sample Input:
ABC#D#E

Sample Output:
CBADE
*/
#include<cstdio>
#include<cmath>
#include<cstring>
#include<iostream>
using namespace std;
const int M=1024;
char data[M];
int layer;

struct node
{
    char data;
    struct node *l;
    struct node *r;
};

void build(node * & t,int l)
{
    if(l>layer)
        return ;
    int i=0;
    while(data[i]=='')
        i++;
    char tc=data[i];
    
    //cout<<i<<endl<<tc<<endl;
    
    data[i]='';
    if(tc=='#')
    {
        t=NULL;
        return ;
    }
    t=new node();
    t->data=tc;
    build(t->l,l+1);
    build(t->r,l+1);
}

void display(node *t)
{
    if(t==NULL)
        return ;
    display(t->l);
    printf("%c",t->data);
    display(t->r);
}

int main()
{
    /*
    printf("%d
",(int)(log(8)/log(2)));
    printf("%f
",(log(7)/log(2)));
    */
    memset(data,'',sizeof(data));
    while(scanf("%s",&data))
    {
        //printf("%s
",data);
        int n=strlen(data)+1;
        /*
        if(log(n)/log(2)>(int)(log(n)/log(2)))
            layer=(int)(log(n)/log(2))+1;
        else*/
            layer=(int)(log(n)/log(2));
        //printf("%d
",layer);
        node *tree;
        build(tree,1);
        display(tree);
    }
    
    return 0;
}

tz@HZAU

2019/3/13