LeetCode: Letter Combinations of a Phone Number
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题目：
https://oj.leetcode.com/problems/letter-combinations-of-a-phone-number/
分析：
DFS
代码：
class Solution{public:vector<string> letterCombinations(string digits){string solution;dfs(digits, 0, solution);return res;}void dfs(string &digits, int index, string &solution){if (index == digits.size()){res.push_back(solution);return;}else{for (auto &r : key[digits[index] - '0']){solution.push_back(r);dfs(digits, index+1, solution);solution.pop_back();}}}vector<string> res;string key[10] = {"", "", "abc", "def", "ghi", "jkl", "mno","pqrs", "tuv", "wxyz"};}; 0 0
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