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First solution in Clear category for Pawn Brotherhood by lancastdw
def attack_squares(pawn):
file, rank = map(ord, pawn)
return chr(file + 1) + chr(rank + 1), chr(file - 1) + chr(rank + 1)
def safe_pawns(pawns):
safe_squares = []
for p in pawns:
safe_squares += attack_squares(p)
return len([p for p in pawns if p in safe_squares])
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
Feb. 8, 2016