http://blog.sina.com.cn/s/blog_61c5b0020100zkw7.html
追赶法
https://blog.csdn.net/time_forgotten/article/details/93884296?ops_request_misc=%257B%2522request%255Fid%2522%253A%2522162564313316780262558757%2522%252C%2522scm%2522%253A%252220140713.130102334…%2522%257D&request_id=162564313316780262558757&biz_id=0&utm_medium=distribute.pc_search_result.none-task-blog-2allsobaiduend~default-3-93884296.first_rank_v2_pc_rank_v29&utm_term=%E8%BF%BD%E8%B5%B6%E6%B3%95matlab&spm=1018.2226.3001.4187 (针对输入数组)
https://wenku.baidu.com/view/885b27a40029bd64783e2c8a?fr=step_zhidao （针对输入abc）