Help me out with this , if i input " aaaabbbccdee " , i should get a ' compressed string ' as output which is " a4b3c2de2 "

Question

If you din't understand I want you to write a program which can count occurrence of string
calculate it
display it with the letter following the count of alphabet
And I want this in time complexity O(NlogN)

Answer 1

here it is
https://code.sololearn.com/cTzUtVkz2VZs/?ref=app

Answer 2

are you giving any online coding exams or wat Ganesh, bcoz all your questions seems familiar to my placement exam questions