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A - ABC400 Party

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• Solution for Problem A by Binary_64

B - Sum of Geometric Series

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• Solution for Problem B by Binary_64

C - 2^a b^2

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• Solution for Problem C by Binary_64

D - Takahashi the Wall Breaker

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• Solution for Problem D by Binary_64

E - Ringo's Favorite Numbers 3

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F - Happy Birthday! 3

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G - Patisserie ABC 3

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