Editorial for An Animal Contest 6 P1 - Workout Routine
Submitting an official solution before solving the problem yourself is a bannable offence.
The answer is never .
The intended solution for this subtask is to output the sequence . Since all terms are divisible by , their sum is also divisible by .
One possible answer is to first generate the sequence , then fill in the last element with any element that makes the sum divisible by .