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A - 123233

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B - Humidifier 1

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C - Adjacency Matrix

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D - Better Students Are Needed!

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• User Editorial by MatrixGroup

E - Gap Existence

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F - Consecutive

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G - 1D Country

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H - Subsequence Path

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I - Earn to Advance

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• Another Solution by evima
• Similar problem (Codeforces) by spheniscine