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TODO 1079. Letter Tile Possibilities   medium

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.

TODO Approach

Write your approach here.

TODO Python

class Solution:
    def numTilePossibilities(self, tiles: str) -> int:

TODO C++

class Solution {
public:
    int numTilePossibilities(string tiles) {
        
    }
};