说明：  24点求解程序。本程序的输入是一个名叫Inpute.txt的文本文件，里面存放着4个数和计算目标（这个程序可以指定计算结果，不是24也可以）。输出是一个名叫Result.txt的文本文件，由程序计算产生，记录的是运算步骤。
(24-point solver. The input of this program is a named Inpute.txt a text file stored inside the number and calculate the target (this program can be specified to calculate the results, instead of 24 also). The output is a the named Result.txt text file, generated by the program to calculate, record computation steps.)