就dfs吧.... 然后,我傻了.前一道题不用考虑空,这道题就要考虑.... 还有注意vector要引用传递 class Solution { public: void dfs(string temp,vector<string>&ret,string digits,int index,string* str,int len) { if(index==len) { ret.push_back(temp); return; } else { int n=str[(digits[index…

> 简洁易懂讲清原理,讲不清你来打我~ 输入字符串,输出对应整数 ![在这里插入图片描述](https://img-blog.csdnimg.cn/2cc144b3db264abba6e4…

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.…

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", "cd", "ce", "cf"]. 说明: 尽管上面的答案是按字…

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", "cd", "ce", "cf"]. 说明:尽管上面的答案是按字典…

[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…

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…

题目 电话号码的字母组合 给一个数字字符串,每个数字代表一个字母,请返回其所有可能的字母组合. 下图的手机按键图,就表示了每个数字可以代表的字母. 样例 给定 "23" 返回 ["ad", "ae", "af", "bd", "be", "bf", "cd", "ce", "cf"] 注意 以上的答案是按照词…

Medium! 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", "cd", "ce", "cf"].…

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…