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Hack!
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PKU v. THU (Preliminary Round 2)
Time Limit: 1.0 s
Memory Limit: 1024 MB
Interactive
Hackable ✓
[
+2
]
The 2nd Universal Cup. Stage 22: Hangzhou
J. Mysterious Tree
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This problem is prepared by
pb0207
,
rddccd
, and
sserxhs
.
源文件:answer
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