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@@ -0,0 +1,32 @@
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+#!/usr/bin/env python3
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+import sys
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+from itertools import pairwise
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+
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+def parse(inp):
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+ DXDY = (1, 0), (0, 1), (-1, 0), (0, -1)
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+ for line in inp:
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+ direction, distance, color = line.split()
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+ normal_instruction = DXDY['RDLU'.index(direction)], int(distance)
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+ color_instruction = DXDY[int(color[7])], int(color[2:7], 16)
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+ yield normal_instruction, color_instruction
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+
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+def follow(instructions):
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+ x = y = 0
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+ for (dx, dy), distance in instructions:
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+ x += dx * distance
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+ y += dy * distance
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+ yield x, y
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+
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+def dig(instructions):
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+ x, y = zip(*follow(instructions))
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+ v = len(x)
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+ area = abs(sum(x[i] * y[(i + 1) % v] - y[i] * x[(i + 1) % v]
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+ for i in range(v))) // 2 # Shoelace formula
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+ outer = sum(abs(bx - ax + by - ay)
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+ for (ax, ay), (bx, by) in pairwise(zip(x + x[:1], y + y[:1])))
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+ inner = area - outer // 2 + 1 # Pick's theorem
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+ return outer + inner
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+
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+normal, color = zip(*parse(sys.stdin))
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+print(dig(normal))
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+print(dig(color))
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Taddeus Kroes