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Hack!
Time Limit: 4 s
Memory Limit: 128 MB
Total points: 100
# 6360. 求和
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The problem was used in the following contest:
2016 天津市代表队选拔赛 Day 2 (TJOI 2016 Day 2)
2016 河北省队选拔赛 Day 2 (HEOI 2016 Day 2)
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