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1079. Letter Tile Possibilities #1326

Answered by mah-shamim
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We need to determine the number of distinct non-empty sequences that can be formed using the letters from a given set of tiles. Each tile has a letter printed on it, and sequences are considered distinct based on the order of letters, even if they use the same letters from different tiles.

Approach

The approach involves using backtracking to generate all possible permutations of the tiles for all possible lengths from 1 to the length of the tiles string. We use a frequency map to keep track of the count of each letter and ensure that we do not generate duplicate sequences by carefully managing the counts of each letter during the backtracking process.

  1. Frequency Map: First, we create a fr…

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@basharul-siddike
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@mah-shamim
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mah-shamim Feb 17, 2025
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Answer selected by basharul-siddike
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