摘要: Three Sequences 2200 https://www.luogu.com.cn/problem/CF1406D 题解:贪心地想,令x为答案,则x应该为b的末项和c的首项,而每一步a(i)->a(i+1)若上升则b上升,若下降则c下降。故2x-a1>=up,2x-an>=down,解方程组 阅读全文
posted @ 2023-03-13 22:29 wrong,anser 阅读(33) 评论(0) 推荐(0)