Mind Palace

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"It's a memory technique, a "SORT" of mental map. All you have to do is find your way back to it." Moriarty challenges Sherlock by giving him $N$ sequences of integers such that all given integers are distinct. Sherlock decided to merge all the sequences into a single lexicographically smallest sequence and store that sequence in his Mind Palace, such that, all the original sequences are subseq

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solution.cppC++17

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