检查一个如下的6 x 6的跳棋棋盘，有六个棋子被放置在棋盘上，使得每行、每列有且只有一个，每条对角线(包括两条主对角线的所有平行线)上至多有一个棋子。请编一个程序找出所有跳棋放置的解。-Checkerboard checks following a 6 x 6, there are six pieces are placed on the board, so that each row, each column and only one, each diagonal (two parallel lines, including all the main diagonal) the most one piece. Please compile a program to find all solutions checkers placed.