201803总结 整体思路 Number 1&2 太简单了 Number 3 思路就是两个vector做比较就行了，还挺简单的 Number 4 不会，但是貌似可以暴力，明天试试看 Was this page helpful? Thanks! You can leave some advices in the comment section below. Thanks! You can leave some advices in the comment section below.