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Odd even level difference
Easy Accuracy: 53.67% Submissions: 23368 Points: 2

Given a Binary Tree. Find the difference between the sum of node values at even levels and the sum of node values at the odd levels.

Example 1:

Input:
1
/   \
2     3

Output: -4

Explanation:
sum at odd levels - sum at even levels
= (1)-(2+3) = 1-5 = -4

Example 2:

Input:
10
/    \
20      30
/  \
40    60

Output: 60

Explanation:
sum at odd levels - sum at even levels
= (10+40+60) - (20+30)
= 110 - 50
= 60

You dont need to read input or print anything. Complete the function getLevelDiff() which takes root node as input parameter and returns an integer.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(height of tree)

Constraints:
1 ≤ N ≤ 10^5

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