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First solution in Clear category for Pawn Brotherhood by kumaus
def safe_pawns(pawns):
safe = 0
for pawn in pawns:
# Construct the two fields from which the pawn could be covered
# Note that positions "outside the field" are admissible
cover1 = chr(ord(pawn[0])-1) + chr(ord(pawn[1])-1)
cover2 = chr(ord(pawn[0])+1) + chr(ord(pawn[1])-1)
# Now check if at least one cover position is occupied
if cover1 in pawns or cover2 in pawns:
safe += 1
return safe
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
Sept. 11, 2015