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#include <iostream>
using namespace std;
struct node{
char data;
struct node*left;
struct node*right;
};
int k;
node* build(){
char c;
cin>>c;
if(c=='0') return NULL;
node* x=new node;
x->data=c;
x->left=build();
x->right=build();
return x;
}
void pre_order(node *t){
if(t==NULL) return ;
if(t->left==NULL&&t->right==NULL) k++;
cout<<t->data<<" ";
pre_order(t->left);
pre_order(t->right);
}
void mid_order(node *t){
if(t==NULL) return ;
mid_order(t->left);
cout<<t->data<<" ";
&nb...
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