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First solution in Clear category for Pawn Brotherhood by v0id
def iter_defender_positions(pawn):
"""generate pawn positions that can defend given pawn"""
columns = 'abcdefgh' # avoid manipulations with character codes
col, row = columns.index(pawn[0]), int(pawn[1])
if row > 1:
defender_row = str(row - 1)
if col > 0:
yield columns[col - 1] + defender_row
if col < 7:
yield columns[col + 1] + defender_row
def safe_pawns(pawns):
return sum(1 for pawn in pawns
if pawns.intersection(iter_defender_positions(pawn)))
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
Nov. 14, 2015
