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First solution in Clear category for Pawn Brotherhood by lousapetr
def guards(pos):
if pos[1] == '1':
return None, None
row = str(int(pos[1]) - 1)
guard_left = guard_right = None
if pos[0] > 'a':
guard_left = chr(ord(pos[0])-1) + row
if pos[0] < 'h':
guard_right = chr(ord(pos[0])+1) + row
return guard_left, guard_right
def is_safe(pos, pawns):
return guards(pos)[0] in pawns or guards(pos)[1] in pawns
def safe_pawns(pawns):
return len([pos for pos in pawns if is_safe(pos, 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
Dec. 15, 2015
