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Yes, variations of pattern-to-string mapping and backtracking problems appear in FAANG-style interviews. They test recursion, constraint handling, and the ability to manage mappings between elements in two sequences.
Backtracking is needed because the correct substring mapping is not known in advance. The algorithm must try multiple substring possibilities for each pattern character and revert choices when they lead to conflicts.
The optimal approach uses backtracking with a hash map to maintain the mapping between pattern characters and substrings. A set is also used to ensure each substring is mapped to only one character. The algorithm explores possible assignments and backtracks when a conflict occurs.
A hash map is essential to store the mapping from pattern characters to substrings, while a hash set tracks which substrings are already used. These structures help enforce the bijection constraint efficiently during recursion.
