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Hack!
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Day 1
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Time Limit: 1.0 s
Memory Limit: 256 MB
Total points: 100
Hackable ✓
#12559. 序列
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The problem was used in the following contests:
“华为智联杯”无线程序设计大赛暨2025年上海市大学生程序设计竞赛
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