摘要: The 2019 ICPC Asia Yinchuan Regional Programming Contest/2019银川区域赛 D Easy Problem(莫比乌斯容斥+欧拉降幂) 题面: 题意: 给定4个整数$n,m,d,k$,让你求$\sum_\sum_\dots\sum_^gcd(a_ 阅读全文
posted @ 2020-11-24 17:21 茄子Min 阅读(232) 评论(0) 推荐(0) 编辑