1079. Letter Tile Possibilities
https://leetcode.com/problems/letter-tile-possibilities
Description
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.
ac
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