简单的回溯法! class Solution { public: void backTrack(string digits, vector<string> words, string ans, vector<string>& res, int k, int flag[]) { if(k == digits.size()) { res.push_back(ans); } else { ; i<words[('].size(); i++) { string t = ans…

# -*- coding: utf8 -*-'''__author__ = 'dabay.wang@gmail.com' 17: Letter Combinations of a Phone Numberhttps://oj.leetcode.com/problems/letter-combinations-of-a-phone-number/ Given a digit string, return all possible letter combinations that the numbe…

17. Letter Combinations of a Phone Number Medium Given a string containing digits from 2-9 inclusive, return all possible letter combinations that the number could represent. A mapping of digit to letters (just like on the telephone buttons) is given…

一.题目说明 题目17. Letter Combinations of a Phone Number,题目给了下面一个图,输入一个字符串包括2-9,输出所有可能的字符组合. 如输入23所有可能的输出: "ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf" 二.我的做法 这个题目…

我现在在做一个叫<leetbook>的免费开源书项目,力求提供最易懂的中文思路,目前把解题思路都同步更新到gitbook上了,需要的同学可以去看看 书的地址:https://hk029.gitbooks.io/leetbook/ 017. Letter Combinations of a Phone Number[M] 问题 Given a digit string, return all possible letter combinations that the number could r…

Given a string containing digits from 2-9inclusive, 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 letters. E…

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. Input:Digit string "23" Output: ["ad", "ae"…

1 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. Input:Digit string "23" Output: ["ad", "ae&quo…

题目描述: 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&quo…

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", &q…

一天一道LeetCode (一)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. Input:Digit string "23" Output: ["ad",…

Given a string containing digits from 2-9 inclusive, 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 letters.…

Given a string containing digits from 2-9 inclusive, 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 letters.…

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", &q…

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", &q…

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", &…

Given a string containing digits from 2-9 inclusive, 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 letters.…

题目 Given a string containing digits from 2-9 inclusive, 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 lett…

Given a string containing digits from 2-9 inclusive, 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 letters.…

作者: 负雪明烛 id: fuxuemingzhu 个人博客:http://fuxuemingzhu.cn/ 个人公众号:负雪明烛 本文关键词:电话号码, 字母组合,回溯法,题解,leetcode, 力扣,Python, C++, Java 目录 题目描述 题目大意 解题方法 回溯法 内置函数 循环 日期 题目地址:https://leetcode.com/problems/generate-parentheses/description/ 题目描述 Given a string contain…

要求 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 1 不对应任何字母    示例 输入:"23" 输出:["ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf"] 思路 递归向后一位一位生成所有可能字符串 s(digits)是digits…

题目: 思路:设置两个List,一个存储当前层,一个存储最终层 public class Solution { public List<String> letterCombinations(String digits) { List<String> listRet=new ArrayList<String>(); if(digits==""){ return listRet; } Map<Character,String> map=new…

leetcode 第17题 分析 char*和string相互转化 char*(或者char)转string 可以看看string的构造函数 default (1) string(); copy (2) string (const string& str); substring (3) string (const string& str, size_t pos, size_t len = npos); from c-string (4) string (const char* s); fr…

一.题目链接: https://leetcode.com/problems/letter-combinations-of-a-phone-number/ 二.题目大意: 给定一段数字字符串,其中每个数字字符对应了如下的字母字符,求出输入字符串对应的所有可能的字母字符串集合. 例如,输入数字字符串"23",其对应的所有可能的字母字符串集合为 ["ad", "ae", "af", "bd", "be&…

class Solution { public: map<char,string> dict; vector<string> letterCombinations(string digits) { dict['] = "abc"; dict['] = "def"; dict['] = "ghi"; dict['] = "jkl"; dict['] = "mno"; dict['] =…

题目链接 https://leetcode.com/problems/letter-combinations-of-a-phone-number/?tab=Description HashMap<Character, String> map = new HashMap<>(); map.put("); map.put("); map.put(', "abc"); map.put(', "def"); map.put(',…

思路:用深搜遍历九宫格字符串,一开始做的时候发生了引用指向空地址的问题,后来发现是vector不能直接=赋值. class Solution { public: int len; ]={"abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"}; void search(int pos, st…

1. 原题链接 https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/ 2. 题目要求 给定一个数字字符串digits,每一个数字对应拨号键盘上的数字,每个数字又对应不同的字母.例如“3”对应“d“.“e”.“f”三个字母.输出digits所含数字对应的所有字母组合. 例如,digits="23",输出:["ad", "ae", "…

递归DFS class Solution { Map<Character, String> mapping = new HashMap<>(); public List<String> letterCombinations(String digits) { List<String> res = new ArrayList<>(); if (digits.isEmpty()) return res; mapping.put('2', "a…

[Leetcode]17. 电话号码的字母组合(Letter Combinations of a Phone Number) 题目描述: 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. 示例: 输入:"23"输出:["ad", "ae", "af", "bd", "be", "bf&qu…