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Maximum Rectangular Area in a Histogram
Medium Accuracy: 47.42% Submissions: 67248 Points: 4

Find the largest rectangular area possible in a given histogram where the largest rectangle can be made of a number of contiguous bars. For simplicity, assume that all bars have the same width and the width is 1 unit, there will be N bars height of each bar will be given by the array arr.

Example 1:

Input:
N = 7
arr[] = {6,2,5,4,5,1,6}
Output: 12
Explanation: Example 2:

Input:
N = 8
arr[] = {7 2 8 9 1 3 6 5}
Output: 16
Explanation: Maximum size of the histogram
will be 8  and there will be 2 consecutive
histogram. And hence the area of the
histogram will be 8x2 = 16.

The task is to complete the function getMaxArea() which takes the array arr[] and its size N as inputs and finds the largest rectangular area possible and returns the answer.

Expected Time Complxity : O(N)
Expected Auxilliary Space : O(N)

Constraints:
1 ≤ N ≤ 106
1 ≤ arr[i] ≤ 1012

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