Download Largest Rectangle in Histogram.py
class Solution(object): def largestRectangleArea(self, heights): """ :type heights: List[int] :rtype: int """ # https://leetcode.com/discuss/70983/4ms-java-solution-using-o-n-stack-space-o-n-time largest_rectangle = 0 ls = len(heights) # heights[stack[top]] > heights[pos] > heights[stack[top - 1]] # keep the increase order stack = [-1] top, pos = 0, 0 for pos in range(ls): while top > 0 and heights[stack[top]] > heights[pos]: largest_rectangle = max(largest_rectangle, heights[stack[top]] * (pos - stack[top - 1] - 1)) top -= 1 stack.pop() stack.append(pos) top += 1 while top > 0: largest_rectangle = max(largest_rectangle, heights[stack[top]] * (ls - stack[top - 1] - 1)) top -= 1 return largest_rectangle if __name__ == "__main__": s = Solution() print s.largestRectangleArea([2,1,5,6,2,3])
Leetcode 084 Largest Rectangle in Histogram problem solution in python3 with explanation. This is the best place to expand your knowledge and get prepared for your next interview.
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