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>
#define NIL NULL

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

Node root = {NIL, NIL};

Node treeMinimum(Node x);
Node treeMaximum(Node x);
Node treeSuccessor(Node x);
void treeDelete(Node z);
void inorder( Node );
void preorder( Node );
void insert( int );
Node treeSearch( Node, int );

//-----------------------------------------------------------
int main(){
  int n, i, x;
  char com[20];
  scanf("%d", &n);

  for ( i = 0; i < n; i++ ){
    scanf("%s", com);
    if ( com[0] == 'f' ){
      scanf("%d", &x);
      Node t = treeSearch(root, x);
      if ( t != NIL ) printf("yes\n");
      else printf("no\n");
    } else if ( com[0] == 'i' ){
      scanf("%d", &x);
      insert(x);
    } else if ( com[0] == 'p' ){
      inorder(root);
      printf("\n");
      preorder(root);
      printf("\n");
    }/* else if ( com[0] == 'd' ){
      scanf("%d", &x);
      treeDelete(treeSearch(root, x));
    }*/
  }

  return 0;
}
/*
//----------------------------------------------------------
Node treeMinimum(Node x){


}

//------------------------------------------------------------
Node treeMaximum(Node x){


}
*/
//----------------------------------------------------------
Node treeSearch(Node u, int k){
    while(u != NIL){
	if(k == u->key) return u;
	else if(k < u->key) u = u->left;
	else u = u->right;
    }
    return NIL;
}

//----------------------------------------------------------
/*
Node treeSuccessor(Node x){


}

//----------------------------------------------------------
void treeDelete(Node z){
  Node y; // node to be deleted
  Node x; // child of y



}*/

//-----------------------------------------------------------
void insert(int k){
  Node y = NIL;   //y is parent of the k 
  Node x = root;   //x is the root node
  Node z;   //z is new node for the k

  //initialization
  z = malloc(sizeof(struct node));
  z->key = k;
  z->left = NIL;
  z->right = NIL;
  //decide where to place the z node
  while(x != NIL){  //when Binary Tree T is not empty.
      y = x;  //substitute x for y as a parent
      if(z->key < x->key) x = x->left;
      else  x = x->right;
  }
  z->parent = y;
  //connect them
  if(y == NIL) root = z;//when Binary Tree T is empty
  else if(z->key < y->key) y->left = z;
  else y->right = z;
}

//-------------------------------------------------------------
void inorder(Node u){
    if(u != NIL){
	inorder(u->left);
	printf(" %d", u->key);
	inorder(u->right);
    }
    return ;
}

//-------------------------------------------------------------
void preorder(Node u){
    if(u != NIL){
	printf(" %d", u->key);
	preorder(u->left);
	preorder(u->right);
    }
    return ;
}