34周赛题解
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AcWing 4209. 三元组
https://www.acwing.com/file_system/file/content/whole/index/content/3636912/
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AcWing 4210. 数字
https://www.acwing.com/file_system/file/content/whole/index/content/3637213/
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AcWing 4211. 序列重排
https://www.acwing.com/solution/content/84505/
