Please don't do that, we are not in 1970's C code. Variables should be declared as local as possible. You are not saving up anything and the compiler will optimize it for you anyways.

Clever approach but the time complexity is O(N^2)

You could declare variable c out of for, that variable will created for one times

No, time complexity is still O(n * (n + n + n)) = O(n²).

it's soo fucking clever man, nice one !

Yes

too slow...

"If you use an array to store the number of occurances …"
it sound to me like a histogram, and for that a hash map would be a better data structure.

Will it work with string containing only one cymbol?

beautiful

This is some beautiful code!

I agree this is a cool solution but far from following best practices. Runtime complexity for this solution is O(N^2) which can easily be solved in O(N)