51 lines
1.2 KiB
Python
51 lines
1.2 KiB
Python
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#!/usr/bin/env python3
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import fileinput
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N = 1000
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def main():
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diag = [[0] * N for _ in range(N)]
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vents = [
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[
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tuple(int(coord) for coord in coords.split(","))
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for coords in str(line).split(" -> ")
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]
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for line in fileinput.input()
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]
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for (x1, y1), (x2, y2) in vents:
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xsign = -1 if x2 < x1 else 1
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ysign = -1 if y2 < y1 else 1
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if x1 == x2:
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# vertical line
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for y in range(y1, y2 + ysign, ysign):
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diag[y][x1] += 1
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elif y1 == y2:
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# horizontal line
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for x in range(x1, x2 + xsign, xsign):
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diag[y1][x] += 1
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part1 = sum(point >= 2 for row in diag for point in row)
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print("part 1:", part1)
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for (x1, y1), (x2, y2) in vents:
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xsign = -1 if x2 < x1 else 1
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ysign = -1 if y2 < y1 else 1
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if x1 != x2 and y1 != y2:
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# diagonal line
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y = y1
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for x in range(x1, x2 + xsign, xsign):
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diag[y][x] += 1
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y += ysign
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part2 = sum(point >= 2 for row in diag for point in row)
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print("part 2:", part2)
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if __name__ == "__main__":
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main()
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