【leetcode】1079. Letter Tile Possibilities
題目如下： You have a set of tiles, where each tile has one letter tiles[i]printed on it. Return the number of possible non-empty sequences ...
原文：leetcode 1079 Letter Tile Possibilities
lc Letter Tile Possibilities 利用遞歸解決 觀察題目給出的例子 AAB 按照長度分 A, B AA, AB, BA AAB, ABA, BAA 不難發現，長度為n的解可由長度為n 的解推出 利用遞歸，每次長度為n的解可以遞歸了化簡至長度為 而且為了避免記錄組合結果以用來每次比較組合成的結果是否曾經出現過，例如AA和AB都可以生成AAB。 我們需要寫遞歸時將每次的增量，即 ...
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