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https://khws4v1.myhome.cx/article/2016/06/srand%e3%81%af1%e5%9b%9e%e3%81%a0%e3%81%91%e3%81%a7%e3%81%84%e3%81%84%ef%be%80%ef%be%9e%ef%be%99%ef%bd%ab%ef%bd%ab%ef%be%9d/
srand()は1回だけでいいダルォォン?