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hackerrank.comCompany LogoProblem link : https://www.hackerrank.com/challenges/most-commons/problemDifficulty : Medium TipDon't forget we should sort as alphabet order if the occurrence is sameTo do sort, don't sort resultwe can sort input string like belowBefore sort : bbccaaAfter sort : aabbccWe should manage two things together, one is key(such as 'a') and the other is key's number of occurre..