摘要:
# [AtCoder Beginner Contest 280](https://atcoder.jp/contests/abc280) ## **A - Pawn on a Grid** ### Problem Statement 题意:给你$N$行$M$列的网格,问你有多少个# ### Solu 阅读全文
摘要:
# Cartesian tree(笛卡尔树) ## 1.概念 比如拿最小的当根建树,中序遍历是原数组 ![image](https://img2023.cnblogs.com/blog/3214093/202306/3214093-20230628214110647-453940263.png) 笛 阅读全文