有关于vector的程序，用于检测两个vector量是否相同，但是此程序还可以检测两个vector含有多个重复元素的情况并加入了非法输入检测。属于考虑周全的程序。-This assignment asks students to write a program to find if two vectors have the same elements with the condition that the order and multiplicities are ignored. For req