Lua Coding Practice

Solve Word Character Coverage Ranges using Lua Language

Solve Word Character Coverage Ranges using Lua to enhance your skills with lua coding practice , master coding concepts, and prepare for interviews with practical exercises and detailed solutions.

Word Character Coverage Ranges

Difficulty : Hard

Categories :

  • Strings

Given a string s and a list of strings words, find all word ranges in s such that all unique characters in s between the range appear in at least one of the words in the words list. Return a list of tuples [start, end] representing the ranges (0-indexed). If no such range exists, return an empty list.

Constraints:

  • 1 ≤ s.length ≤ 10⁴
  • 1 ≤ words.length ≤ 50
  • 1 ≤ words[i].length ≤ 50
  • All strings consist of lowercase English letters only
  • All ranges should be minimal (cannot be reduced while maintaining the condition)

Examples:

Input: s = "abcde", words = ["ab","cd","e"]
Output: [[0,4]]
Explanation: The entire string forms a valid range as each character appears in at least one word.
Input: s = "abcdefgh", words = ["abc","def"]
Output: [[0,5]]
Explanation: Characters 'g' and 'h' don't appear in any word, so the longest valid range is "abcdef".
Input: s = "adobecodebanc", words = ["abc","ode"]
Output: [[0,3],[3,6]]
Explanation: "adob" and "code" form valid ranges.

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