棋盘覆盖问题 设一个n*n棋盘，n=2k,用L 型条块覆盖棋盘中除一个指定方格外的所有方格，每个L型条块可恰好覆盖3 个方格。 实验内容：设计分治算法实现棋盘覆盖,要求图形化。-Board covering the establishment of a n* n chessboard, n = 2k, with the L-slice coverage for a specified board, in addition to all the extra square grid, eac