Method place

tools/python-3.11.9-amd64/Tools/demo/queens.py:41–45

(self, x, y)

        return not self.row[y] and not self.up[x-y] and not self.down[x+y]

    def place(self, x, y):
        self.y[x] = y
        self.row[y] = 1
        self.up[x-y] = 1
        self.down[x+y] = 1

    def remove(self, x, y):
        self.y[x] = None