#include<stdio.h>
#include<stdlib.h>
#define M 100

typedef struct N *P;
typedef struct N{int d;P l,r;}N;P root;

int t=-1;P stk[M];
P cn(int v){P n=malloc(sizeof(N));n->d=v;n->l=n->r=NULL;return n;}

P cr(P r,int v){
    if(!r)return cn(v);
    if(v<r->d)r->l=cr(r->l,v);
    else if(v>r->d)r->r=cr(r->r,v);
    return r;
}

void po(P r){if(r){po(r->l);po(r->r);printf("%d ",r->d);}}
void pr(P r){if(r){printf("%d ",r->d);pr(r->l);pr(r->r);}}
void io(P r){if(r){io(r->l);printf("%d ",r->d);io(r->r);}}

int main(){
    root=cr(root,6);
    root=cr(root,4);
    root=cr(root,83);
    root=cr(root,25);
    root=cr(root,42);

    printf("Binary Tree (In-Order): ");io(root);puts("");
    printf("Binary Tree (Pre-Order): ");pr(root);puts("");
    printf("Binary Tree (Post-Order): ");po(root);puts("");

    return 0;
}