指針:https://blog.csdn.net/qq_35429198/article/details/109331937
排序:https://www.cnblogs.com/myeln/articles/17576193.html
遞歸作業:https://www.luogu.com.cn/training/370327#problems
哈夫曼編碼:https://zhuanlan.zhihu.com/p/415467000
圖:https://www.luogu.com.cn/training/330046#problems
排列組合:https://www.cnblogs.com/myeln/articles/17602018.html
動態規劃: