懒得写了 , 直接上链接
https://blog.csdn.net/qian2213762498/article/details/79683905?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522167298130716800182769230%2522%252C%2522scm%2522%253A%252220140713.130102334..%2522%257D&request_id=167298130716800182769230&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2~all~top_positive~default-1-79683905-null-null.142^v70^one_line,201^v4^add_ask&utm_term=next_permutation&spm=1018.2226.3001.4187
标签：2522%,next,blog,pernutation,prev,id,79683905 From： https://www.cnblogs.com/llihaotian666/p/17030154.html