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>

struct node{
  struct node *right;
  struct node *left;
  struct node *parent;
  int key;
};
typedef struct node * Node;
#define NIL NULL

Node root;

Node treeMinimum(Node x){
  while(x->left != NIL)
    x = x->left;
  
  return x;
}

Node treeMaximum(Node x){
  while(x->right != NIL)
    x = x->right;
  
  return x;
}

Node treeSearch(Node x, int k){
  if(x == NIL || k == x->key)
    return x;
  if(k < x->key)
    return treeSearch(x->left,k);
  else
    return treeSearch(x->right,k);

}

Node treeSuccessor(Node x){
  Node y;
  
  if(x->right != NIL)
    return treeMinimum(x->right);

  y = x->parent;
  
  while(y != NIL && x == y->right){
    x = y;
    y = y->parent;
  }

  return y;
}

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

  if(z->left == NIL || z->right == NIL)
    y = z;
  else
    y = treeSuccessor(z);

  if(y->left != NIL)
    x = y->right;
  else
    x = y->right;

  if(x != NIL)
    x->parent = y->parent;

  if(y->parent == NIL)
    root = x;
  else if(y == y->parent->left)
    y->parent->left = x;
  else
    y->parent->right = x;

  if(y != z)
    z->key = y->key;
}

void insert(int k){
  Node y = NIL;
  Node x = root;
  Node z;

  z = 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(Node x){
  if(x != NIL){
    inorder(x->left);
    printf(" %d",x->key);
    inorder(x->right);
  }
}
  
void preorder(Node x){
  if(x != NIL){
    printf(" %d",x->key);
    preorder(x->left);
    preorder(x->right);
  }
}


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;
}