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Sorting the elements by frequency

July 27, 2018adminLeave a comment

Given an array, how do we sort the elements by descending order of their frequency? Also if two elements appear for same number of times, one which appeared first in the input array should be placed first. For example, if A = [7, 6, 1, 7, 1, 3, 6, 6, 2] The output should be…

Merging k sorted lists

November 4, 2013adminLeave a comment

Given K sorted lists, how to merge them into a single sorted list? Let total number of elements in K sorted lists is N. We have to form a single sorted list of length N. For example let us consider the following input lists{4, 19, 27}{1, 6, 50, 73}{9, 45, 59, 67} The output should…