Viewing other problems with insights similar to only this insight from Codeforces 1860A: Not a Substring:
Try to construct two strings with a small overlap, then the given string cannot be a substring of both. by Solarion
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Codeforces 1811F: Is It Flower?
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- Be careful of printing anything BEFORE you read all the input. Be careful of moving on in a while loop if nothing has CHANGED. by mathmastersd
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Codeforces 1648C: Tyler and Strings
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- When dealing with lexographically smaller strings, you can consider fixing the first i characters to be the same between the strings and then the (i + 1)th character can be different. by mathmastersd
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Codeforces 1370D: Odd-Even Subsequence
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- Be careful of distinguishing the length of a subsequence being even from the length of the ORIGINAL sequence being even. by mathmastersd
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Codeforces 913G: Power Substring
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- 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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