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lowest-common-ancestor's Introduction

Lowest-Common-Ancestor

Description

This is a recursive algorithm that returns the Lowest Common Parent node of any two given nodes in a binary tree.

Complexity

Time: Worst 0(n)

Given the tree and inputs below, we recieve the following outputs:

      //                  3
     //            /             \
    //       11                          5
   //     /      \                   /       \
  //   2            6            17            4
 //  /   \        /   \         /  \         /   \
//  7     9     13     21     14     8     19     1 


LCA(7, 9)  -> 2

LCA(6, 13) -> 6

LCA(4, 6)  -> 3

LCA(17, 4) -> 5

LCA(21, 2) -> 11

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