摘要：
``标签真好用。但要是vj挂了，我这里的题面也挂了…… Time limit 2000 ms Memory limit 262144 kB Source Educational Codeforces Round 62 (Rated for Div. 2) Tags combinatorics dp 阅读全文
摘要：
Problem You are given an array $a_1$,$a_2$,…,$a_n$ and an array $b_1$,$b_2$,…,$b_n$. For one operation you can sort in non decreasing order any subarr 阅读全文