摘要：
hdu1203 思路：计算一个offer都没有的概率，容斥一下 hdu 2602 经典01背包 c++ include include include include include include include include include include include include in 阅读全文
摘要：
"莫比乌斯反演模板 Gym 101982B" 题意 给你a,b,c,d四个数，求[a,b]与[c,d]，互质的数的对数 代码 c++ include include include include include include include include include include inc 阅读全文