Histogram Rectangle Analyzer

You are given an array of integers where each integer represents the height of a histogram bar. Your task is to find the area of the largest rectangle that can be formed using these bars, where the rectangle must extend across contiguous bars in the histogram. The solution must run efficiently in linear time. Implement a function that reads from standard input and prints the area of the largest rectangle. ### Example: Input: [2,1,5,6,2,3] Output: 10 ### Input format: A single line containing a list of non-negative integers representing heights of histogram bars, e.g. [2,1,5,6,2,3]. Maximum length of the array is 100. ### Output format: A single integer representing the area of the largest rectangle.