LeetCode(17) － Letter Combinations of a Phone Number
经典的backtracking（回溯算法）的题目。当一个题目，存在各种满足条件的组合，并且需要把它们全部列出来时，就可以考虑backtracking了。当然，backtracking在一定程度上属 ...
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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