随笔分类 -  周赛总结

摘要:# T1 [方差](http://222.180.160.110:1024/contest/3917/problem/1) 观察式子:$\large\sum\limits_{i=1}^{N-1} \sum\limits_{j=i+1}^{N}\left|A_{i}-A_{j}\right|^{2}= 阅读全文
posted @ 2023-07-22 07:15 CloudWings 阅读(55) 评论(0) 推荐(0)
摘要:# Summary **Score:** $100+90+0+50+4=244$ # T1 [减法操作](http://222.180.160.110:1024/contest/3887/problem/1) **Algorithm: 思维** 考虑对 $n$ 分奇偶讨论: - 偶数:显然 最小质因 阅读全文
posted @ 2023-07-17 21:21 CloudWings 阅读(71) 评论(0) 推荐(0)