Please give me some hint to solve this problem: https://codeforces.me/gym/102769/problem/G
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A couple of hints:
the limits look daunting. Is there a special case you can treat separately which will make the limits less daunting?
consider how we might identify ranges of integers [L,R] such that for L <= x <= R, floor(kth root(x)) = Q, for some integer Q. If we iterate over Q, how would that range [L,R] contribute to the answer?