摘要：题目传送门 题意 求 (∑i=1n∑j=1nijgcd(i,j)) mod p" role="presentation" style="position: relative;">(∑ni=1∑nj=1ijgcd(i,j)... 阅读全文

摘要：题目链接 题意：求∑i=1n∑j=1mφ(ij)" role="presentation" style="position: relative;">∑ni=1∑mj=1φ(ij)∑i=1n∑j=1mφ(ij)模10000000... 阅读全文

摘要：题目传送门 题意：求从区间[L,H]" role="presentation" style="position: relative;">[L,H][L,H]（L" role="presentation" style="position: relative;">LL和H... 阅读全文

摘要：题目链接 题意：求∑i=1n∑j=1nf(ij)" role="presentation" style="position: relative;">∑ni=1∑nj=1f(ij)∑i=1n∑j=1nf(ij)模1000000007" rol... 阅读全文