Editorial for Mock CCC '19 Contest 1 J3 - Pusheen Eats Tuna Sashimi and Tuna Nigiri

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For the first subtask, the answer is always YES, as one can always order N pieces of sashimi.

For the second subtask, it suffices to check if N is divisible by A, as any valid order that contains nigiri can be replaced with \frac{B}{A} pieces of sashimi.

For the third subtask, to check if a given amount is obtainable, we can use brute force to see if it is possible to spend N dollars buying exactly zero pieces of sashimi and spending everything else on nigiri, then buying exactly one piece of sashimi and using the rest on nigiri, and going up until we have exhausted our available budget only on sashimi.


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