..
by yu__xuan @ 2019-03-15 20:28:37
![](https://cdn.luogu.com.cn/upload/pic/54108.png)
错误输出。。。
by yu__xuan @ 2019-03-15 20:29:29
求解,不应该是输出1吗???
by yu__xuan @ 2019-03-15 20:31:32
明白了
find_first_of()及find_last_of()查找的是单个字符。。
by yu__xuan @ 2019-03-15 21:23:49