* 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", "bf", "cd", "ce", "cf"]. */ public class LetterCombinatio
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...
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
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...
Leetcode: Letter Combinations of a Phone Number Given a digit string,returnall 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"...
这道题让我们求电话号码的字母组合,即数字2到9中每个数字可以代表若干个字母,然后给一串数字,求出所有可能的组合,相类似的题目有Path Sum II 二叉树路径之和之二,Subsets II 子集合之二,Permutations 全排列,Permutations II 全排列之二,Combinations 组合项,Combination Sum 组合之和和Combination Sum II 组合之和...
Section 28: Amazon Backtracking question: Letter Combination of a Phone Number (Medium) Lecture 128 Explanation - Letter Combinations of a Phone Number Lecture 129 Intuition - Letter Combinations of a Phone Number Lecture 130 Walkthrough - Letter Combinations of a Phone Number Lecture 131 Code - ...
class LetterCombinationsPhoneNumber { func letterCombinations(_ digits: String) -> [String] { guard digits.count > 0 else { return [String]() } var combinations = [String](), combination = "" let numberToStr = ["", "", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv",...
17. 电话号码的字母组合(Letter Combinations of a Phone Number) 共3 种 3.1 k+ 18. 四数之和(4Sum) 共4 种 11.5 k+ 19. 删除链表的倒数第 N 个结点(Remove Nth Node From End of List) 共4 种 1.2 k+ 20. 有效的括号(Valid Parentheses) 共2 种 1.8 k+ 21. 合并两个有序链表(Merge Two ...
Letter Combinations of a Phone Number 3 3 string DFS 18 4Sum 3 2 array 19 Remove Nth Node From End of List 2 3 linked list Two Pointers 20 Valid Parentheses 2 5 string Stack 21 Merge Two Sorted Lists 2 5 linked list sort Two Pointers merge 22 Generate Parentheses 3 4 string DFS 23...