I saw a comment that said you only have to check the ranges $l, l + 5$ and $r - 5, r$. At least one of them will have a $\gcd$ equal to $1$. During the hacking phase, I tried pretty hard to find a counterexample, but I couldn't.
I saw a comment that said you only have to check the ranges $l, l + 5$ and $r - 5, r$. At least one of them will have a $\gcd$ equal to $1$. During the hacking phase, I tried pretty hard to find a counterexample, but I couldn't.