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oneliner expanded for clarity solution in Clear category for Pawn Brotherhood by abe.dillon
def safe_pawns(pawns):
return sum(1 for pawn in pawns if is_protected(pawn, pawns))
def is_protected(pawn, pawns):
f, r = pawn
candidates = {"%s%s" % (chr(ord(f) + x), int(r) - 1) for x in (-1, 1)}
return candidates & 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
Feb. 2, 2015
