Letter Tile Possibilities Calculator
1079. Letter Tile Possibilities: Use backtracking DFS to generate all possible permutations of tiles for lengths 1 to n. Manage counts with frequency map to avoid duplicates. Complexity manageable due to input length constraint.
1079. Letter Tile Possibilities Difficulty: Medium Topics: Hash Table, String, Backtracking, Counting You have n tiles, where each tile has one letter tiles[i] printed on it. Return the number of possible non-empty sequences of letters you can make using the letters printed on those tiles. Example 1: Input: tiles = "AAB" Output: 8 Explanation: The possible sequences are "A", "B", "AA", "AB", "BA", "AAB", "ABA", "BAA". Example 2: Input: tiles = "AAABBC" Output: 188 Example 3: Input: tiles = "V" Output: 1 Constraints: 1 <= tiles.length <= 7 tiles consists of uppercase English letters. H...