參考: 三進(jìn)制實(shí)現(xiàn)哈夫曼:https://wenku.baidu.com/view/375dcb27aaea998fcc220e83.html 最長(zhǎng)單調(diào)遞增子序列:https://blog.csdn.net/owenchan1987/article/details/79456268