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PKU v. THU (Preliminary Round 2)
Time Limit: 3 s
Memory Limit: 128 MB
Total points: 100
# 8290. 礼物
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Custom Test
The problem was used in the following contest:
2017 安徽省队选拔赛 (AHOI 2017) Day 1
2017 湖南省队选拔赛 (HNOI 2017) Day 1
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