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Time Limit: 4 s
Memory Limit: 1024 MB
Total points: 100
Difficulty:
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8
#2558. Critical Vertex
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The problem was used in the following contests:
Petrozavodsk Winter 2022. Day 2. KAIST Contest + KOI TST 2021
XXII Open Cup named after E.V. Pankratiev, Grand Prix of Daejeon
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