I have been doing this code Code Link

Problem is that when I iterating over keys to sort their vector, then sorting is not working properly. Test Case:- 3 4 3 4 3 3[cut] 3 7 5 5[cut] 1 1 5 3[cut] 3 3 7 3[cut] 4 1 5 5[cut] 3 1 5 3[cut]

Any idea why? Thanks in advance:)