Problem:
Binary Search Tree II

Write a program which performs the following operations to a binary search tree $T$ by adding the find operation to A: Binary Search Tree I.

insert $k$: Insert a node containing $k$ as key into $T$.

find $k$: Report whether $T$ has a node containing $k$.

print: Print the keys of the binary search tree by inorder tree walk and preorder tree walk respectively.

Input

In the first line, the number of operations $m$ is given. In the following $m$ lines, operations represented by insert $k$, find $k$ or print are given.

Output

For each find $k$ operation, print "yes" if $T$ has a node containing $k$, "no" if not.

In addition, for each print operation, print a list of keys obtained by inorder tree walk and preorder tree walk in a line respectively. Put a space character before each key.

Constraints

The number of operations $\leq 500,000$

The number of print operations $\leq 10$.

$-2,000,000,000 \leq key \leq 2,000,000,000$

The height of the binary tree does not exceed 100 if you employ the above pseudo code.

The keys in the binary search tree are all different.

Sample Input 1

10
insert 30
insert 88
insert 12
insert 1
insert 20
find 12
insert 17
insert 25
find 16
print

Sample Output 1

yes
no
1 12 17 20 25 30 88
30 12 1 20 17 25 88

Reference

Introduction to Algorithms, Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein. The MIT Press.

Solution in C (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

struct node{
  int key;
  struct node *right;
  struct node *left;
  struct node *parent;
};

struct node *root;
struct node *NIL;

struct node *find(struct node *, int);
void insert(int);
void inorder(struct node *);
void preorder(struct node *);

int main(){

  int i,n,x;

  struct node *t;
  char *com;
  char *cominsert = "insert";
  char *comprint = "print";

  com = (char*)malloc(7*sizeof(char));  

  scanf("%d", &n);

  for(i=0; i<n; i++){
    scanf("%s", com);
    if(com[0] == 'f'){
      scanf("%d", &x);
      t = find(root, x);
      if(t != NIL){
	printf("yes\n");
      }
      else{
	printf("no\n");
      }
    }
    else if(strncmp(com,cominsert,6)==0){
      scanf("%d",&x);
      insert(x);
    }
    else if(strncmp(com,comprint,5)==0){
      inorder(root);
      printf("\n");
      preorder(root);
      printf("\n");
    }
  }

  return 0;
}

struct node *find(struct node *u, int k){
  while (u != NIL && k != u->key){
    if(k < u->key){
      u = u->left;
    }
    else {
      u = u->right;
    }
  }
  return u;
}

void insert(int k){

  struct node *y = NIL;
  struct node *x = root;
  struct node *z;

  z = (struct node *)malloc(sizeof(struct node));

  z->key = k;
  z->left = NIL;
  z->right = NIL;

  while(x != NIL){
    y = x;
    if(z->key < x-> key){
      x = x->left;
    }
    else {
      x = x->right;
    }
  }
  z->parent = y;
  if(y == NIL) {
    root = z;
  }
  else{
    if(z->key < y->key) {
      y->left = z;
    }
    else {
      y -> right = z;
    }
  }
}

void inorder(struct node *u){
  if(u == NIL){
    return;
  }
  inorder(u->left);
  printf(" %d", u->key);
 
  inorder(u->right);
}

void preorder(struct node *u){
  if(u == NIL) {
    return;
  }
  printf(" %d", u->key);
  preorder(u->left);
  preorder(u->right);
}