Viewing insights from Codeforces 913G: Power Substring that are similar (thus shared) with only this insight from Codeforces 1370D: Odd-Even Subsequence: Be careful of distinguishing the length of a subsequence being even from the length of the ORIGINAL sequence being even. by mathmastersd
- Obviously, yes, you can choose the substring to occur at the start and then fill in the rest of the digits in any way. by Solarion
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