Viewing insights from Codeforces 1648C: Tyler and Strings that are similar (thus shared) with only this insight from Codeforces 1146C: Tree Diameter: When doing a bitmask problem, consider comparing each bit one at a time. When comparing with two numbers, consider the place where the bits first differ by tester
- Be careful when multiplying the ways to choose an element (from an array) with a certain value IF previous elements MIGHT have that same value. Consider using a BIT in this case if you can know for sure the number of previous elements with that value. by mathmastersd
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