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...
以后会更新对应的栈操作实现。 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 th...
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 map to any letters. ...
把字符串 "23" 看成 ["a","b",c] * ["d","e","f"] ,而相乘就用两个 for 循环实现即可,看代码应该就明白了。 public List<String> letterCombinations(String digits) { List<String> ans = new ArrayList<String>(); for (int i = 0; i < digits.length(); i++) { ans = mul(ans, ...
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. ...
【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. A mapping of digit to letters (just like on the telephone buttons) is given below. Note that 1 does not map to any letters. ...
建立一个数字和对应字母的字典 遍历每一位数字,同时遍历该数字所对应的字母,然后将对应字母进行叠加 每完成一次遍历,就将数字往后推一位,继续进行遍历 Python源码: classSolution:digit2letters={'2':"abc",'3':"def",'4':"ghi",'5':"jkl",'6':"mno",'7':"pqrs",'8':"tuv",'9':"wxyz",}de...
Solution 其实就是笛卡尔积 image.png classSolution{public List<String>letterCombinations(String digits){List<String>result=newArrayList<>();if(digits==null||digits.length()==0){returnresult;}Map<String,String>phoneDigits=newHashMap<>();phoneDigits.put("0","");phoneDigits.put("1","");phone...
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