lexicographical rank of a string

Question

i am facing difficulty to understand a function please help me

//populateAndIncreaseCount(count, str); // this is the function i am facing difficulty

https://code.sololearn.com/chLd11nt9V6x/?ref=app
https://code.sololearn.com/chLd11nt9V6x/?ref=app
https://code.sololearn.com/chLd11nt9V6x/?ref=app

Answer 1

https://www.sololearn.com/post/75089/?ref=app

Answer 2

Ya I have now changed it please see it