Problem Description Chika gives you an integer sequence a1,a2,…,an and m tasks. For each task, you need to answer the number of “friendly pairs” in a given interval. friendly pair: for two integers a

Problem Description You are given an array a1,a2,…,an(∀i∈[1,n],1≤ai≤n). Initially, each element of the array is unique. Moreover, there are m instructions. Each instruction is in one of the followin

2019.ccpc-wfinal总结 2019ccpc女生赛离它结束有四天了，在这个期间我想了很多，想了想还是决定写这个总结。作为这个队伍唯一的一名大一队员，我很庆幸，能跟着两个学姐一起打比赛，计爱玲师姐，即将工作，张莹俐学姐。这估计都是他们最后一次参加现场赛了，也不知道我以后还能否有机会参加女生赛了。前不久参加2019安徽省ACM竞赛，依旧是以一支女队参加比赛，结局两手空空，这次wfinal，