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 on the telephone buttons) is given below. Note that 1 does not map to any ...
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...
classSolution{public:vector<string>letterCombinations(string digits){ vector<string> combinations;//所有结果容器if(digits.empty()){//易错:如果没有这个判断,输入""错误输出[""],而正确输出是[]returncombinations; } unordered_map<char, string> phoneMap {//hash字典表{'0',""}, {'1',""}, {'2...
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... ...
FindHeaderBarSize FindTabBarSize 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 digits to letters (just like on the telephone buttons) is given below. Note that 1 does not ...
【LeetCode】Letter Combinations of a Phone Number 题目 在手机九宫格键盘上输入一串数字,给出可能打印出来的字符串的集合。 分析 先做一个map将数字映射到键盘上相应的字母集合。 把按键顺序看成深度优先遍历的深度,每次dfs将深度d+1直到d=按键字符串的长度未知,此时即完成了一次按键可能的输出。 实现 代码语言...
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) is given below. ...
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){...
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. ...
Can you solve this real interview question? Letter Combinations of a Phone Number - 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 o