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The question and my solution are attached. I do not know how to correct it. I hope someone can show me a correct and complete answer. Thanks! ![program.png](/attachments/large/4/ea29c5dabdaa2da909f7b82b4277c5f2.png) ![微信图片_20200302011413.png](/attachments/large/4/cdaba293002a1fcf746e6cd6344d4ddb.png) ![微信图片_20200302011421.png](/attachments/large/4/dcfa743ceb40fdcbedd22f1248b6ae97.png) |