首先放出原题:Letter Combinations of a Phone Number Given a string containing digits from2-9inclusive, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like
string combination;backtrack(combinations, phoneMap, digits,0, combination);//核心方法-回溯returncombinations; }voidbacktrack(vector<string> &combinations, unordered_map<char,string> phoneMap,conststring& digits,intindex, string combination){if(index==digits.length()) {//已经走完一个分支combinations...
1. Letter Combinations of a Phone Number(17) 题目: 给定一个仅包含数字 2-9 的字符串,返回所有它能表示的字母组合。 给出数字到字母的映射如下(与电话按键相同)。注意 1 不对应任何字母。 2.permutations 全排列(46) 给定一个没有重复数字的序列,返回其所有可能的全排列。 参考... ...
public ArrayList<String> letterCombinations(String digits) { ArrayList<String> ret = new ArrayList<String>(); StringBuilder sb = new StringBuilder(); letterCombinations(digits, 0, sb, ret); return ret; } private void letterCombinations(String digits, int i, StringBuilder sb, ArrayList<String> re...
【Leetcode】Letter Combinations of a Phone Number 题目链接:https://leetcode.com/problems/letter-combinations-of-a-phone-number/ 题目: 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...
Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. Return the answer in any order. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters. Example...
17. 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 given below. Input:Digit string "23"Output: ["ad", "ae", "af", "bd", "be"...
Given a string containing digits from2-9inclusive, return all possible letter combinations that the number could represent. Return the answer inany order. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters. ...
1. 2. answer: class Solution { public: vector<string> letterCombinations(string digits) { vector<string> letter = {"0","1","abc","def","ghi","jkl","mno","pqrs","tuv","wxyz"}; vector<string> result1,result2; result1.push_back(""); ...
classSolution{public:vector<string>letterCombinations(string digits){ vector<string> ans;if(digits.size() ==0)returnans;intdepth = digits.size();stringtmp(depth,0);dfs(tmp,0, depth, ans, digits);returnans; }voiddfs(string &tmp,intcurdep,intdepth, vector<string> &ans, string &digits){...