#1079

Letter Tile Possibilities

pupil · 405 · lc medium +24 · verified · 83.5% accepted · 3,137 likes · top 95%

Description

You have n tiles where each tile tiles[i] has a printed letter. Return the number of distinct non-empty sequences of letters that can be formed using some or all of the 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

Code

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

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