这是一个判断马鞍点的算法,当用户输入一个二维数组,当一个元素为每行的最小,而又是每列的最大时,它就是马鞍点!-This is a judgment of the saddle point algorithms, user input when a two-dimensional array, When one element per line for the smallest, which is the largest per, it is saddle point!