28 lines
993 B
Python
28 lines
993 B
Python
from numpy.linalg import det
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def test(input, solution):
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# print(f"Running input {input}")
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result = process(input)
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print(f"Solution was {result}")
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assert result == solution
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def run():
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file = open("input.txt", "r")
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return process(file.read()[:-1])
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def process(input):
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points = []
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perimeter_area = 0
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current_point = (0,0)
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for line in input.split("\n"):
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dir_letter = {"2": "L", "0": "R", "1": "D", "3": "U"}[line.split()[2][7]]
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amount = int(line.split()[2][2:7], 16)
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direction = [amount * x for x in {"L": (0,-1), "R": (0,1), "D": (-1,0), "U": (1,0)}[dir_letter]]
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perimeter_area += amount
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current_point = [sum(x) for x in zip(current_point, direction)]
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points.append(current_point)
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indices = list(range(len(points) - 1)) + [-1]
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determinants = [det([[points[i][1], points[i+1][1]],[points[i][0], points[i+1][0]]]) for i in indices]
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return round(abs(sum(determinants))/2) + perimeter_area/2 + 1
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