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Your solution is on point. It only times out because you check every single character in the string. That's the reason to the downvotes. To put it simply, you have to create a list containing the unique characters in your string in order to spare some time.
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Your solution is on point. It only times out because you check every single character in the string. That's the reason to the downvotes. To put it simply, you have to create a list containing the unique characters in your string in order to spare some time.