端午节个人赛-山东省省赛 fireworks（杨辉三角形+组合数+逆元）
Description
Hmz likes to play fireworks, especially when they are put regularly.
Now he puts some fireworks in a line. This time he put a trigger on each firework. With that trigger, each fire
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2017-06-03 20:57:21 ·
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