LeetCode(17) － Letter Combinations of a Phone Number
經典的backtracking（回溯算法）的題目。當一個題目，存在各種滿足條件的組合，並且需要把它們全部列出來時，就可以考慮backtracking了。當然，backtracking在一定程度上屬 ...
原文：【LeetCode】17. Letter Combinations of a Phone Number
Letter Combinations of a Phone Number Given a digit string, return all possible letter combinations that the number could represent. A mapping of digit to letters just like on the telephone buttons is ...
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