def minimax(state, depth, player):
if player == MAX:
best = [-1, -1, -infinity]
else:
best = [-1, -1, +infinity]
if depth == 0 or game_over(state):
score = evaluate(state)
return [-1, -1, score]
for cell in empty_cells(state):
x, y = cell[0], cell[1]
state[x][y] = player
score = minimax(state, depth - 1, -player)
state[x][y] = 0
score[0], score[1] = x, y
if player == MAX:
if score[2] > best[2]:
best = score
else:
if score[2] < best[2]:
best = score
return best
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