Leetcode Problem 1079. Letter Tile Possibilities

1079. Letter Tile Possibilities

Leetcode Solutions

Backtracking with Frequency Count

  1. Initialize a frequency count array of size 26 to 0.
  2. Iterate over the input string tiles and increment the count for each letter.
  3. Define a recursive function backtrack that takes the frequency count array and a reference to the result count.
  4. In backtrack, iterate over the frequency count array.
  5. If the count of the current letter is greater than 0, increment the result count, decrement the letter's count, and call backtrack recursively.
  6. After the recursive call, increment the letter's count to backtrack.
  7. Call backtrack initially with the frequency count array and a result count initialized to 0.
  8. Return the result count minus 1 to exclude the empty string.
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Permutation with Sorting and Unique Check

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