4473번 - This Can’t Go On Forever 다국어

“A long time ago in a galaxy far, far away...”, so long ago, in fact, that the Empire did not exist and there were planets without space travel. In a far corner was a world in which the predominant pet, called tayes, reproduced by budding. Once a taye had separated from its parent, it took one time unit to mature to the point of breeding, which, coincidentally, was the length of time for a new bud to grow and separate from its parent. The tayes are extremely long-lived, so that it became important to investigate how many someone might have, assuming that at time zero the person did not have a taye, and at time one had acquired an immature one, freshly budded from the mature taye belonging to a friend.

This ends up giving the following recurrence: T(0) = 0, T(1) = 1, T(n) = T(n–1) + T(n–2), for n > 1.

Computing at the time involved unsigned binary numbers with 24 bits. That motivated a particularly curious inhabitant, Leon, to investigate the series generated by that recurrence, but constrained by a modulus — and not just the modulo 2²⁴ forced by computing hardware. So the question becomes how long a series of number is generated by this recurrence, subject to arithmetic with a particular modulus, before it begins repeating. Here are the first few series:

The problem is to determine the length of the period for each modulus given in the input file and report it.

The input file contains an indeterminate number of lines, each containing a single integer mod guaranteed to be in the range 2 ≤ mod ≤ 16777216 (2²⁴). The final line contains a 0 as end of data and should not be processed.

For each modulus in the input file, print the modulus, one blank, and then the size of the smallest period of these T numbers under that modulus.