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Second solution in Clear category for Pawn Brotherhood by intspt
def safe_pawns(pawns):
cor = sorted([[int(cor[1]), ord(cor[0]) - ord('a') + 1] for cor in pawns])
s = set()
ans = 0
for (r, c) in cor:
if (r, c) in s:
ans += 1
s.add((r + 1, c - 1))
s.add((r + 1, c + 1))
return ans
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
Aug. 17, 2014
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