Viewing insights from Codeforces 1860A: Not a 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
- Try to construct two strings with a small overlap, then the given string cannot be a substring of both. by Solarion
- What are the extreme strings of length 2n? (most opposite) by Solarion
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