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PKU v. THU (Preliminary Round 2)
Time Limit: 3 s
Memory Limit: 512 MB
# 2067. Evil Subsequence
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The problem was used in the following contest:
Petrozavodsk Winter 2020. Day 9. Yuhao Du Contest 7
XX Open Cup named after E.V. Pankratiev, Grand Prix of Zhejiang
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