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Sorting Elements of an Array by Frequency
Medium Accuracy: 37.02% Submissions: 45146 Points: 4

Given an array A[] of integers, sort the array according to frequency of elements. That is elements that have higher frequency come first. If frequencies of two elements are same, then smaller number comes first.

Input:
The first line of input contains an integer T denoting the number of test cases. The description of T test cases follows. The first line of each test case contains a single integer N denoting the size of array. The second line contains N space-separated integers A1, A2, ..., AN denoting the elements of the array.

Output:
For each testcase, in a new line, print each sorted array in a seperate line. For each array its numbers should be seperated by space.

Constraints:
1 ≤ T ≤ 70
30 ≤ N ≤ 130
1 ≤ Ai ≤ 60 

Example:
Input:
2
5
5 5 4 6 4

5
9 9 9 2 5

Output:
4 4 5 5 6
9 9 9 2 5

Explanation:
Testcase1: The highest frequency here is 2. Both 5 and 4 have that frequency. Now since the frequencies are same then smaller element comes first. So 4 4 comes first then comes 5 5. Finally comes 6.
The output is 4 4 5 5 6.

Testcase2: The highest frequency here is 3. The element 9 has the highest frequency. So 9 9 9 comes first. Now both 2 and 5 have same frequency. So we print smaller element first.
The output is 9 9 9 2 5.

 

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Sorting Elements of an Array by Frequency

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