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 ...
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leetcode 17. Letter Combinations of a Phone Number 本题中无需剪枝 时间复杂度 O(3n* 4m) 空间复杂度 O(n+m) 运行时间 8 ms 内存消耗 7.9 MB m 是输入中对应 3个字母的数字个数(包括数字 2、3、4、5、6、8),n是输入中对应 4个字母的数字个数(包括数字 7、9),m+n是输入数字的总个数。 ...
Leetcode热题100(python) No.17 电话号码的字母组合 Letter Combinations of a Phone Number 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 tel...
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...
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...
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. ...
(digits,phoneDigits,0,"",result);// currentIndex, combinationEntryreturnresult;}privatevoidletterCombinationsHelper(String digits,Map<String,String>phoneDigits,int currentIndex,String combinationEntry,List<String>result){if(currentIndex==digits.length()){result.add(combinationEntry);return;}String current...
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