Showing:
Handle Score
@Ibrahim Nash 6560
@mb1973 5777
@Quandray 5271
@akhayrutdinov 5111
@saiujwal13083 5074
@kirtidee18 4356
@sanjay05 3762
@mantu_singh 3638
@gfgaccount 3601
@marius_valentin_dragoi 3525
Lowest Common Ancestor in a Binary Tree
Medium Accuracy: 39.75% Submissions: 72321 Points: 4

Given a Binary Tree with all unique values and two nodes value n1 and n2. The task is to find the lowest common ancestor of the given two nodes. We may assume that either both n1 and n2 are present in the tree or none of them is present.

Example 1:

Input:
n1 = 2 , n2 =  3
1
/  \
2    3
Output: 1
Explanation:
LCA of 2 and 3 is 1.

Example 2:

Input:
n1 = 3 , n2 = 4
5
/
2
/  \
3    4
Output: 2
Explanation:
LCA of 3 and 4 is 2.



You don't have to read input or print anything. Your task is to complete the function lca() that takes nodes, n1, and n2 as parameters and returns LCA node as output.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(Height of Tree).

Constraints:
1 ≤ Number of nodes ≤ 105
1 ≤ Data of a node ≤ 105