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Number of Ways to Form Target String Given a Dictionary

Explore methods to determine the number of ways to construct a target string from a given list of equal-length words by selecting characters under certain constraints. Understand the use of dynamic programming techniques to efficiently solve this problem and apply modular arithmetic to manage large results.

Statement

You are given a list of nn strings, words, where each string has the same length mm, and a target string, target, of length tt. A target can be formed using the given words under the following rules:

  • You must build the target from left to right.

  • To form the ith character (0-indexed) ...