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Commit a415a95

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ankana2113pre-commit-ci[bot]MaximSmolskiy
authored
Add largest rectangle histogram (#12269)
* added ridge regression * added ridge regression * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * added ridge regression * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * ridge regression * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * resolved errors * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * resolved conflicts * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * added doctests * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * ruff and minor checks * minor chenges * minor checks * minor checks * minor changes * descriptive names * Fix ruff check in loss_functions.py * fixed pre-commit issues * added largest rectangle histogram function * added largest rectangle histogram function * Update frequent_pattern_growth.py * Update loss_functions.py * Delete machine_learning/ridge_regression/__init__.py * Delete machine_learning/ridge_regression/ADRvsRating.csv * Delete machine_learning/ridge_regression/ridge_regression.py * Delete machine_learning/ridge_regression/test_ridge_regression.py --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
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def largest_rectangle_area(heights: list[int]) -> int:
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"""
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Inputs an array of integers representing the heights of bars,
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and returns the area of the largest rectangle that can be formed
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>>> largest_rectangle_area([2, 1, 5, 6, 2, 3])
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10
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>>> largest_rectangle_area([2, 4])
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4
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>>> largest_rectangle_area([6, 2, 5, 4, 5, 1, 6])
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12
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>>> largest_rectangle_area([1])
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1
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"""
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stack: list[int] = []
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max_area = 0
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heights = [*heights, 0] # make a new list by appending the sentinel 0
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n = len(heights)
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for i in range(n):
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# make sure the stack remains in increasing order
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while stack and heights[i] < heights[stack[-1]]:
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h = heights[stack.pop()] # height of the bar
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# if stack is empty, it means entire width can be taken from index 0 to i-1
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w = i if not stack else i - stack[-1] - 1 # calculate width
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max_area = max(max_area, h * w)
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stack.append(i)
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return max_area
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if __name__ == "__main__":
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import doctest
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doctest.testmod()

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