Unique Substring

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Well, before Chef could counter attack, Dr Doof showed his innocent face which moved Chef. Moreover, on hearing his complete story, Chef took pity on him and decided to befriend him. He even decided to play a game with him. The game goes as follows: Chef gives Dr Doof a string $S$ of length $N$ consisting only of lowercase Latin letters and asks him to study the string carefully. A substring

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L1 Observation

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L4 Pseudo-code

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solution.cppC++17

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