说明：  有两种对弈模式：人人对弈模式和人机对弈模式 采用黑屏字符输入输出实现UI（杨老师要求！！） 采用打分机制实现五子棋AI 棋盘大小为15*15，棋盘将显示相应的行列号（A-O） 棋子有两种颜色黑和白，代表着对弈的双方，棋子放在棋盘行列交叉处，黑棋先下 黑白任一方先连成5个棋子形成的直线（横线、竖线、对角线），则该方赢对方输 黑白双方都没连成5个棋子形成的直线，且棋盘已满时，为和局 最后一步下的位置需明显标记
(There are two modes of games: Everyone chess mode and man-machine chess mode using black character input and output achieved UI (Yang teacher asked !!) the use of AI scoring mechanism to achieve backgammon board size is 15* 15, the board will display the corresponding row and column number ( AO) pieces two colors black and white, representing the two sides of chess, the ranks of the pieces on the board at the intersection of the first black and white black connected to either one of the first five straight (horizontal, vertical pieces formed diagonal line), the party did not win the other input connected to both black and white five pieces form straight line, and the board is full, to draw the final step in the required position clearly marked)