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Tasks from hackerrank
Make the process walking backwards the initial string looking for the first occurrence of the adjacent character combination, when the one standing closer to the end of the string is smaller than the one standing closer to the beginning of the string.
When such a combination is found the algorithm has to calculate the difference between the greater of the two found characters and every character in the string, standing behind.
The greater of the two found characters should be swapped with the one, producing the smallest difference. The rest of the string has to be sorted.
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