Editorial for DMPG '18 B2 - Mimi and Modulus - Olympiads Online Judge

Editorial for DMPG '18 B2 - Mimi and Modulus

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Author: Kirito

For the first subtask, it suffices to iterate through all of the numbers $1, 2, \dots, N$ ~1, 2, \dots, N~, and print the maximum residue mod $M$ ~M~.

Time Complexity: $\mathcal O(N)$ ~\mathcal O(N)~

For the second subtask, we can observe that the answer is upper bounded by $N$ ~N~ and $M-1$ ~M-1~, as the result of any integer mod $M$ ~M~ will be less than $M$ ~M~. Thus the answer is $\min(N, M-1)$ ~\min(N, M-1)~.

Time Complexity: $\mathcal O(1)$ ~\mathcal O(1)~

Bonus: When is the answer $N$ ~N~ and when is it $M-1$ ~M-1~?

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