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 a sorted order, first by the value of i, and if two pairs have the same i, by the value of j.
Constraints:
text.lengthwords.lengthwords[i].lengthtextandwords[i]consist of lowercase English letters.All the strings of
wordsare unique.