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First solution in Clear category for Pawn Brotherhood by ackounts
def safes(coord):
s = set()
a, n = ord(coord[0]), int(coord[1])
s |= {chr(a+1) + str(n+1)}
s |= {chr(a-1) + str(n+1)}
return s
def safe_pawns(pawns):
s = {x for p in pawns for x in safes(p)}
return len(pawns&s)
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 31, 2015