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PKU v. THU (Preliminary Round 2)
Time Limit: 1 s
Memory Limit: 512 MB
# 6351. Exact Subsequences
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Custom Test
The problem was used in the following contest:
Petrozavodsk Winter 2023. Day 6: Um_nik mod 998 244 353 Contest
The 1st Universal Cup. Stage 13: Iberia
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