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摘要：There weren’t very good places soe years ago. Guangzhou had a lot of cars and the air wasn’t nice. People didn’t look after the environent and threw rubbish to......

There weren’t very good places soe years ago. Guangzhou had a lot of cars and the air wasn’t nice. People didn’t look after the environent and threw rubbish to

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NB/T 4701947047 / 47046 / / / 47028 表2 800H化学成分 元素 C Si Mn P S Ni 国标NS1102 0.05~0.10 ≤1.0 ≤1.5 ≤0.03 ≤0.015 30.0~35.0 美标N08810 0.05~0.10 ≤1.0 ≤1.5

N B / T 4 7 0 1 9 4 7 0 4 7 / 4 7 0 4 6 / / / 4 7 0 2 8 biao 2 8 0 0 H hua xue cheng fen yuan su C S i M n P S N i guo biao N S 1 1 0 2 0 . 0 5 ~ 0 . 1 0 ≤ 1 . 0 ≤ 1 . 5 ≤ 0 . 0 3 ≤ 0 . 0 1 5 3 0 . 0 ~ 3 5 . 0 mei biao N 0 8 8 1 0 0 . 0 5 ~ 0 . 1 0 ≤ 1 . 0 ≤ 1 . 5 . . .

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http://lydsy/JudgeOnline/problem.php?id=2005 莫比乌斯函数。 不妨设N>=M。 我们发现,坐标(x,y)到(0,0)的连线上有gcd(x,y)个点(包含自己)。 所以答案