# Leetcode 482 - License key formatting

Note:

• Iterate backwards
• Use a count to store how many word we’ve got for a segmant.
• Reset count when it hits k and add - to the front.
• Special case is when there is a dash left on the front.

Question:

You are given a license key represented as a string s that consists of only alphanumeric characters and dashes. The string is separated into n + 1 groups by n dashes. You are also given an integer k.

We want to reformat the string s such that each group contains exactly k characters, except for the first group, which could be shorter than k but still must contain at least one character. Furthermore, there must be a dash inserted between two groups, and you should convert all lowercase letters to uppercase.

Example:
Code: