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At LeetCode, our mission is to help you improve yourself and land your dream job. C solutions contained some sort of a counter inside the loop. Big Sorting Big Sorting Source : Hackerrank Consider an array of numeric strings, , where each string is a positive number with anywhere from to digits. HackerRank / Algorithms / Sorting / Big Sorting / Solution. That built in method runs in O(n log(n)) by performing a dual pivot quicksort on the collection. Source : Hackerrank Marie invented a Time Machine and wants to test it by time-traveling to visit Russia on the Day of the Programmer (the 256th day of the year) during a year in the inclusive range from 1700 to 2700. how would have nikola tesla's ideas changed the world. Hackerrank - Diagonal Difference. The solution creates a stack of values. 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