摘要：
题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=6759 Problem Description Sandy likes to play with robots. He is going to organize a running competition 阅读全文
摘要：
题目链接：https://codeforces.com/contest/1382 B. Sequential Nim（博弈） C. Prefix Flip （思维题） D. Unmerge（背包DP） B. Sequential Nim 题目大意：给你n堆石子，每堆$a_i$个，你必须按顺序从左到右 阅读全文