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convert strings to list coordinates solution in Clear category for Pawn Brotherhood by johnhaines
def safe_pawns(pawns):
count = 0
pawnList = []
D = {"a":1,"b":2,"c":3,"d":4,"e":5,"f":6,"g":7,"h":8}
#
# Convert "alpha|number" strings to [n,n]
#
for pawn in pawns:
pawn = list(pawn)
pawnList.append([D[pawn[0]],int(pawn[1])])
#
# check preceeding diagonals to left and right to see if they contain a pawn
#
for p in pawnList:
if [(p[0]-1),(p[1]-1)] in pawnList or [(p[0]+1),(p[1]-1)] in pawnList:
count += 1
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
July 31, 2014