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Grokking the Coding Interview Patterns in C++

Solution: Sort Array by Increasing Frequency

Understand how to sort an integer array based on the frequency of values, with ties broken by descending numeric order. Learn to use frequency maps and custom sorting keys to efficiently solve frequency analysis problems common in coding interviews.

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Statement

Given an array of integers nums, sort the array in increasing order based on the frequency of each value. If multiple values share the same frequency, sort those values in decreasing order.

Return the sorted array.

Constraints:

  • 1≤1 \leq nums.length ≤100\leq 100

  • −100≤-100 \leq ...