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Solution: Index Pairs of a String

Explore how to implement a trie data structure to identify all index pairs of substrings in a text that match words from a list. Learn to build and traverse the trie to efficiently find matches, understand the algorithm's time and space complexities, and apply this pattern for optimized substring searching in coding interviews.

Statement

Given a string text and an array of strings words, return a list of all index pairs [i, j] such that the substring text[i...j] is present in words.

Return the pairs [i, j] in sorted order, first by the value of i, and if two pairs have the same i, by the value of j.

Constraints:

  • 11 \leq text.length 100\leq 100

  • 11 \leq words.length 20\leq 20 ...