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First solution in Clear category for Pawn Brotherhood by e.roboda
def safe_pawns(pawns):
index = lambda s: (int(s[1]), ord(s[0]))
ipawns = set(map(index, pawns))
cnt = [(r-1, c-1) in ipawns or (r-1, c+1) in ipawns for r,c in ipawns]
return cnt.count(True)
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. 7, 2015
