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First solution in Clear category for Pawn Brotherhood by jantechner
def safe_pawns(pawns):
def get_coord(cell):
return ord(cell[0])-96, int(cell[1])
def defend_coord(x, y):
defend = []
if (x+1 <= 8) and (y+1 <= 8):
defend.append([x+1, y+1])
if (x-1 <= 8) and (y+1 <= 8):
defend.append([x-1, y+1])
return defend
board = [[0 for j in range(9)] for i in range(9)]
pawns, ans = list(pawns), 0
for pawn in pawns:
for pwn in defend_coord(*get_coord(pawn)):
board[pwn[0]][pwn[1]] = 1
for pawn in pawns:
ans += board[get_coord(pawn)[0]][get_coord(pawn)[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
Nov. 18, 2016
