求两个字符串的最长公共子序列，可以手动输入也可以从文件读入字符串，字符串中允许有空格出现，这是广西大学的算法实验代码，如果是本校学生下载请注意修改，这是我自己写的，写得不好请海涵。-Seeking the longest common subsequence of two strings, you can manually input can also be read from a file into a string, string allows spaces appear, the algorithm experimental code Guangxi University, if our students download Note to modify This is my own writing, please Haihan poorly written.