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First solution in Clear category for Pawn Brotherhood by makoto_yamagata
def safe_pawns(pawns):
guard_pawns = lambda p: {
'%c%c' % (ord(p[0])-1, ord(p[1])-1), '%c%c' % (ord(p[0])+1, ord(p[1])-1)
}
is_safe = lambda p: len(guard_pawns(p).intersection(pawns)) > 0
return sum(map(is_safe, pawns))
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
July 10, 2015
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