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First solution in Clear category for Pawn Brotherhood by koheimiya
from functools import reduce
def inc(c, i=1):
return chr(ord(c) + i)
def dangerzone(pos):
xs = [inc(pos[0], i) for i in (-1, 1)]
y = inc(pos[1])
return {x + y for x in xs}
def safe_pawns(pawns):
unsafe = reduce(set.union, map(dangerzone, pawns))
return len(pawns & unsafe)
if __name__ == '__main__':
#These "asserts" using only for self-checking and not necessary for auto-testing
assert safe_pawns({"b4", "d4", "f4", "c3", "e3", "g5", "d2"}) == 6
assert safe_pawns({"b4", "c4", "d4", "e4", "f4", "g4", "e5"}) == 1
May 5, 2016
