2012-08-10 11:27:36 +02:00
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from __future__ import print_function
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import random
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def pick_random_elements(xs, n):
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for i in range(min(n, len(xs))):
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i1 = random.randrange(i, len(xs))
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yield xs[i1]
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xs[i1] = xs[i]
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2012-08-11 02:22:29 +02:00
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def manhattan_dist(p0, p1):
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x0, y0 = p0
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x1, y1 = p1
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return abs(x1 - x0) + abs(y1 - y0)
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