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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
The denominator should just be the length of the string. The numerator will be incremented by 1 each time you see a character that is greater than 'n'. Hopefully that helps enough for you to solve this one!
Your code would be better if you wrote;
if(s.chatAt(m)>'n') c++;
Instead of listing each char individually!