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40 lines
1.0 KiB
Python
40 lines
1.0 KiB
Python
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"""
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Problem Statement:
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By starting at the top of the triangle below and moving to adjacent numbers on
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the row below, the maximum total from top to bottom is 23.
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3
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7 4
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2 4 6
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8 5 9 3
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That is, 3 + 7 + 4 + 9 = 23.
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Find the maximum total from top to bottom in triangle.txt (right click and
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'Save Link/Target As...'), a 15K text file containing a triangle with
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one-hundred rows.
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"""
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import os
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def solution() -> int:
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"""
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Finds the maximum total in a triangle as described by the problem statement
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above.
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>>> solution()
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7273
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"""
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script_dir = os.path.dirname(os.path.realpath(__file__))
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triangle_path = os.path.join(script_dir, "triangle.txt")
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with open(triangle_path) as in_file:
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triangle = [[int(i) for i in line.split()] for line in in_file]
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while len(triangle) != 1:
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last_row = triangle.pop()
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curr_row = triangle[-1]
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for j in range(len(last_row) - 1):
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curr_row[j] += max(last_row[j], last_row[j + 1])
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return triangle[0][0]
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if __name__ == "__main__":
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print(solution())
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