How to Solve License Key Formatting Problem
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License Key Formatting
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. ...
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Understanding the License Key Formatting Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
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. Return the reformatted license key.
License Key Formatting
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Examples
s = "5F3Z-2e-9-w", k = 4"5F3Z-2E9W"The string s has been split into two parts, each part has 4 characters. Note that the two extra dashes are not needed and can be removed.
s = "2-5g-3-J", k = 2"2-5G-3J"The string s has been split into three parts, each part has 2 characters except the first part as it could be shorter as mentioned above.
Constraints
1 <= s.length <= 105s consists of English letters, digits, and dashes '-'.1 <= k <= 104How Interview Coder Helps with Leetcode Problems
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