首页 > 代码库 > LeetCode 17 Letter Combinations of a Phone Number (电话号码字符组合)
LeetCode 17 Letter Combinations of a Phone Number (电话号码字符组合)
题目链接 https://leetcode.com/problems/letter-combinations-of-a-phone-number/?tab=Description
HashMap<Character, String> map = new HashMap<>(); map.put(‘0‘, "0"); map.put(‘1‘, "1"); map.put(‘2‘, "abc"); map.put(‘3‘, "def"); map.put(‘4‘, "ghi"); map.put(‘5‘, "jkl"); map.put(‘6‘, "mno"); map.put(‘7‘, "pqrs"); map.put(‘8‘, "tuv"); map.put(‘9‘, "wxyz");
My java solution with FIFO queue
https://discuss.leetcode.com/topic/8465/my-java-solution-with-fifo-queue
public List<String> letterCombinations(String digits) { LinkedList<String> ans = new LinkedList<String>(); String[] mapping = new String[] {"0", "1", "abc", "def", "ghi", "jkl", "mno", "pqrs", "tuv", "wxyz"}; ans.add(""); for(int i =0; i<digits.length();i++){ int x = Character.getNumericValue(digits.charAt(i)); while(ans.peek().length()==i){ String t = ans.remove(); for(char s : mapping[x].toCharArray()) ans.add(t+s); } } return ans;}
参考代码:
package leetcode_50;import java.util.HashMap;import java.util.LinkedList;import java.util.List;/*** * * @author pengfei_zheng * 优先队列使用 */public class Solution17 { public List<String> letterCombinations(String digits) { LinkedList<String> ans = new LinkedList<String>(); if(digits == null || digits.length() == 0){ return ans; } HashMap<Character, String> map = new HashMap<>(); map.put(‘0‘, "0"); map.put(‘1‘, "1"); map.put(‘2‘, "abc"); map.put(‘3‘, "def"); map.put(‘4‘, "ghi"); map.put(‘5‘, "jkl"); map.put(‘6‘, "mno"); map.put(‘7‘, "pqrs"); map.put(‘8‘, "tuv"); map.put(‘9‘, "wxyz"); ans.add(""); for(int i =0; i<digits.length();i++){ char key = digits.charAt(i); while(ans.peek().length()==i){//遍历直到达到电话号码长度时结束 String t = ans.remove();//移除旧的ans值 for(char s : map.get(key).toCharArray()) ans.add(t+s);//添加新的ans } } return ans; }}
LeetCode 17 Letter Combinations of a Phone Number (电话号码字符组合)
声明:以上内容来自用户投稿及互联网公开渠道收集整理发布,本网站不拥有所有权,未作人工编辑处理,也不承担相关法律责任,若内容有误或涉及侵权可进行投诉: 投诉/举报 工作人员会在5个工作日内联系你,一经查实,本站将立刻删除涉嫌侵权内容。