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Largest value in each level
Easy Accuracy: 84.09% Submissions: 2839 Points: 2

Given a binary tree, find the largest value in each level.

Example 1:

Input :
        1
       / \
      2   3 

Output : 1 3
Explanation : 
There are two levels in the tree :
1. {1}, max = 1
2. {2, 3}, max = 3

Example 2:

Input :
        4
       / \
      9   2
     / \   \
    3   5   7 

Output : 4 9 7
Explanation : 
There are three levels in the tree:
1. {4}, max = 4
2. {9, 2}, max = 9
3. {3, 5, 7}, max=7
Your task :
You don't need to read input or print anything. Your task is to complete the function largestValues() which takes the root node of the tree as input and returns a vector containing the largest value in each level. 
 
Expected Time Complexity : O(n) , where n = number of nodes
Expected Auxiliary Space : O(n) , where n = number of nodes
 
Constraints : 
1 ≤ Number of nodes ≤ 10^5

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Largest value in each level

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