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First solution in Clear category for Pawn Brotherhood by ape364
def safe_pawns(pawns):
pawns_grid = set()
count = 0
for pawn in pawns:
pawns_grid.add((int(pawn[1]) - 1, ord(pawn[0]) - ord('a')))
for row, col in pawns_grid:
count += (row - 1, col - 1) in pawns_grid or (row - 1, col + 1) in pawns_grid
return count
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
May 10, 2016