Can you help me figure out where the first solution breaks down (NPLQ19D)?

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Problem statement: NPLQ19D
Solution one: WA
Solution two: AC

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your code fails for this type of test
1
zwsvso

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Hey, thanks :slightly_smiling_face: Do you know why it fails there?

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i don’t know how unordered_set places(str.begin(),str.end()); this works

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unordered_set places(str.begin(),str.end()) this changes the order of characters in places while copying.
using a normal vector like this should be better 9LHeAb - Online C++ Compiler & Debugging Tool - Ideone.com i guess.