LeetCode 482: License Key Formatting Solution

Master LeetCode problem 482 (License Key Formatting), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

482. License Key Formatting

Easy

String

Problem Explanation

Explanation

To solve this problem, we can follow these steps:

Remove all dashes from the input string and convert all lowercase letters to uppercase.
Calculate the length of the first group by finding the remainder when dividing the length of the modified string by k.
Create a new string by iterating through the modified string and inserting dashes after every k characters, except for the first group.
Return the reformatted license key.

Time complexity: O(n) where n is the length of the input string s. Space complexity: O(n) for storing the modified string.

Solution Code

class Solution {
    public String licenseKeyFormatting(String s, int k) {
        StringBuilder sb = new StringBuilder();
        for (char c : s.toCharArray()) {
            if (c != '-') {
                sb.append(Character.toUpperCase(c));
            }
        }
        
        int firstGroupLen = sb.length() % k;
        StringBuilder res = new StringBuilder();
        int i = 0;
        while (i < sb.length()) {
            if (i > 0 && (i - firstGroupLen) % k == 0) {
                res.append('-');
            }
            res.append(sb.charAt(i));
            i++;
        }
        
        return res.toString();
    }
}

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