摘要：Description Viruses are usually bad for your health. How about fighting them with... other viruses? In this problem, you need to find out how to synth 阅读全文

摘要：建立一个回文自动机，然后开一个桶遍历一下回文树就好了. code: #include <cstdio> #include <vector> #include <string> #include <cstring> #include <algorithm> #define N 500007 using 阅读全文

摘要：Code: 阅读全文

摘要：主要是初始化那里需要注意一下. 然后不要忘记每次给 $last$ 节点的大小++ #include <cstdio> #include <string> #include <cstring> #include <algorithm> #define N 300008 #define ll long 阅读全文