此为按键部分的,读取按键值是否有按键判断部分函数-this as part of the button, reading keys value judgment whether some function keys

此为按键部分的,读取按键值是否有按键判断部分函数-this as part of the button, reading keys value judgment whether some function keys

该函数为华为程序设计大赛编程题，用于判断对于N引脚电路板的布线方案是否存在交叉。-The function is Huawei programming contest programming problem, used to determine the N-pin circuit board layout program whether there is cross.