Largest Rectangle in Histogram

Given an array of integers where each integer represents the height of a histogram bar, write a program to find the area of the largest rectangle that can be formed in the histogram. Bars are adjacent to each other in the array. Use a stack to determine the largest rectangle area efficiently. Input format: A single line with space-separated integers representing the histogram heights. Output format: Print a single integer representing the area of the largest rectangle. Example: Input: 2 1 5 6 2 3 Output: 10