C++: Sorting Elements according to Frequency


We are going to write a program to sort the elements of an array by Frequency. If two elements have the same frequency of occurrence, then they are sorted in increasing order.

For eg. an array has { 2, 3, 2, 4, 5, 12, 12, 3, 4, 3 }

Then the output will be

3 3 3 2 2 4 4 12 12 5



Since
_____________________________
| Element     |    Frequency |
|                   |                     |
|     3            |        3            |
|     2            |        2            |
|     4            |        4            |
|     12          |        2            |
|____5_______|______1________|

Note: We can not sort String with this program.

We are using C++: STL Iterators so visit this link so you can understand the code.

program.cpp

The Output of the program is



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