Leetcode Letter Combinations of a Phone Number
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string keys [10] = {" ", "", "abc", "def", "ghi", "jkl", "mno", "pqrs","tuv", "wxyz"}; void dfs(vector<string> &result, string s , int i, string digits){ if(i == digits.length()){ result.push_back(s); return; } int d = (int) digits[i] - '0'; for(int j = 0; j < keys[d].length(); j++){ s[i] = keys[d][j]; dfs(result, s, i+1, digits); } } vector<string> letterCombinations(string digits) { int n = digits.length(); vector<string> result; string s (n, '*'); dfs(result, s, 0, digits); return result; } 0 0
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