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A - Max Inversion
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B - Exist Multiples
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C - Flood
D - Double Permutations
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E - Even Degree
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F - Mth Next Permutation
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G - Road Closed
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H - Traveling PCT Problem
I - NPCA Kingdom
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J - Excluded LCM
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Nachia
K - Li
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- 別解 by Cyanmond
L - Lexicographic Euler Tour
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blackyuki
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より高速（ではない）解法 by Nachia
M - Random Drawing
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N - Range Flip
O - Swapping Desks
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P - Sum of Max of Difference
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