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First solution in Clear category for Pawn Brotherhood by Kayne97
def safe_pawns(pawns):
pawns = {ord(s[0])*10 + int(s[1]) for s in pawns}
return len([p for p in pawns if (pawns & {p-11,p+9}) != set()])
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
Aug. 14, 2014
