Orac and LCM
For the multiset of positive integers $s=\{s_1,s_2,\dots,s_k\}$, define the Greatest Common Divisor (GCD) and Least Common Multiple (LCM) of $s$ as follow: $\gcd(s)$ is the […]
Orac
Orac and Game of Life
Please notice the unusual memory limit of this problem. Orac likes games. Recently he came up with the new game, “Game of Life”. You should […]
Orac and Medians
Slime has a sequence of positive integers $a_1, a_2, \ldots, a_n$. In one operation Orac can choose an arbitrary subsegment $[l \ldots r]$ of this […]
