Algorithms and Data Structures

  • Profound Academy

    • Status
      • 1
        Implementation
      • 2
        Bitwise operations
      • 3
        Prefix Sums
      • 4
        Sliding window / Two pointers
      • 5
        Modular Arithmetic
      • 6
        Number Theory
      • 7
        Binary Search
      • 8
        Basic Sorting
      • 9
        Greedy Algorithms
      • 10
        Basic Dynamic Programming
      • 11
        Recursion
      • 12
        Linked LIst
      • 13
        Queue & Stack
      • 14
        Binary tree + BST
      • 15
        Divide & Conquer + Advanced Sorting
      • 16
        Heap
      • 17
        Hashing
      • 18
        Graph Representation
      • 19
        BFS

    • Find the second smallest value in a BST

    Given an empty binary search tree with no nodes, you are asked to perform 2 kinds of queries:
    1. insert x - insert the value x in the BST
    1. smallest - print the second smallest element in the BST
    Given q queries, you are asked to write a program to perform these queries.

    Input

    The first line of the input contains a single number q (1 ≤ q ≤ 1000).
    The next q lines contain queries. For all the insert queries, the value of x does not exceed in absolute value. For all the smallest queries, it’s guaranteed that the BST has at least 2 elements.

    Output

    For each smallest query, the program should print the second smallest element in the binary search tree.

    Examples

    Input
    Output
    7 insert 2 insert 1 smallest insert 10 smallest insert -1 smallest
    2 2 1
     

    Constraints

    Time limit: 1 seconds

    Memory limit: 512 MB

    Output limit: 1 MB

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