leetcode個人題解——#17 Letter Combinations of a Phone Number

阿新 • • 發佈：2019-02-23

urn its ati 深搜 etc earch ber arch git

思路：用深搜遍歷九宮格字符串，一開始做的時候發生了引用指向空地址的問題，後來發現是vector不能直接=賦值。

class Solution {
public:
    int len;
    
    string map[8]={"abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"};
    void search(int pos, string res, vector<string>& a, string digits){
        if(pos == len) return;
        string 
 s = map[digits[pos] - ‘2‘];
        for (int i = 0;i < s.size(); i++)
        {
            if(pos == len - 1)a.push_back(res + s[i]);
            else search(pos + 1, res + s[i], a, digits);
        }
    }
    
    vector<string> letterCombinations(string digits) {
        vector<string 
> ans;
        len = digits.size();    
        if(len == 0)return ans;
        search(0,"",ans,digits);
        return ans;   
    }
};

urn its ati 深搜 etc earch ber arch git 思路：用深搜遍歷九宮格字符串，一開始做的時候發生了引用指向空地址的問題，後來發現是vector不能直接=賦值。 class Solution { public: int len;

Leetcode 17. Letter Combinations of a Phone number

res bsp self. col join lee num nat leetcode 求給出的數字串，如果按照電話鍵盤的編譯方式，可以給出多少那些對應的數字組合。例如： Input:Digit string "23" Output: ["ad", "ae", "af"

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class stat def es2017 不同的進行先進先出 ati tps 1. 原題鏈接 https://leetcode.com/problems/letter-combinations-of-a-phone-number/description/ 2. 題目要

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poi clu char evel 個數字 The let alt input Given a string containing digits from 2-9 inclusive, return all possible letter combinations that

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commons 註意構建 media ber str http wiki pan 給定一個僅包含數字 2-9 的字符串，返回所有它能表示的字母組合。給出數字到字母的映射如下（與電話按鍵相同）。註意 1 不對應任何字母。示例: 輸入："23" 輸出：["ad", "

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這個問題我最開始的想的是使用樹的結構去做，之後用python實現的時候是使用了幾個for迴圈： class Solution: def letterCombinations(self, digits): """ :type digits: str

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激動人心啊，終於能以這種操作ac了第一遍submit忘記處理空，第二遍就ac了 Runtime: 2 ms, faster than 91.37% of Java online submissions for Letter Combinations of a Phone Num

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題目描述：給定一個僅包含數字 2-9 的字串，返回所有它能表示的字母組合。給出數字到字母的對映如下（與電話按鍵相同）。注意 1 不對應任何字母。示例：輸入："23" 輸出：["ad", "ae", "af", "bd", "be", "bf", "cd

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一.題目連結：　　https://leetcode.com/problems/letter-combinations-of-a-phone-number/ 二.題目大意：　　給定一段數字字串，其中每個數字字元對應瞭如下的字母字元，求出輸入字串對應的所有可能的字母字串集合。　　　　例如，輸入數

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遞迴思想，字串逐步減短 #include <iostream> #include <vector> #include <algorithm> #include <math.h> #include <stdio.h&g

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