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Hack!
Day 1
Day 2
Live
Time Limit: 1 s
Memory Limit: 128 MB
Total points: 100
# 6294. 树
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Custom Test
The problem was used in the following contest:
2016 湖南省队选拔赛 (HNOI 2016) Day 1
Time Limit: 2s → 1s
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