[JAVA]コードテスト:新しいアイデンティティを推奨

コーディングテスト:新しいアイデンティティを推奨

質問する

I/O例

返信コード

import java.util.*;

class Solution {
    public String solution(String new_id) {
        String answer = "";
        
        answer = new_id.toLowerCase(); //1단계 
        answer = answer.replaceAll("[^-_a-z0-9.]",""); //2단계
        answer = answer.replaceAll("[.]{2,}","."); //3단계
        answer = answer.replaceAll("^[.]|[.]$",""); //4단계
    
        if (answer.equals("")){ //5단계
            answer = "a";
        }
        
        if (answer.length()>15){ //6단계
            answer = answer.substring(0,14);
         if (answer.substring(14).equals(".")){
                answer = answer.replace("[.]","");
            } }
        
        if (answer.length()<3){ //7단계
                do {
                answer += answer.substring(answer.length());
                } while (answer.length()<3);
            }
        
        return answer;
        }
        
    }

実行結果

今日学んだこと(2021-11-25)

特に第二段階はどうすればいいのか、悩んでいました.条件文と重複文を使用すると、コードが長すぎると思います.したがって,他の方法を探す際に発見されたのは「正規式」であり,正規式を用いるには10秒以上の実行時間がかかり,プログラマから結果値を得ることができない.正規式のほかに、条件文や複文を乱用するほか、別の方法を探さなければならない.

正規表現の定理

パスした回答(2021-11-29)

class Solution {
    public String solution(String new_id) {
        
        //1단계
        new_id = new_id.toLowerCase(); 
        
        //2단계
        String[] specialCharArr = {"~","!","@","#","$","%","^","&","*","(",")","=","+","[","{","]","}",":","?",",","<",">","/"};
        
        for(int i=0; i<specialCharArr.length; i++){
            if(new_id.contains(specialCharArr[i])){
                new_id = new_id.replace(specialCharArr[i],"");
        }
            }
        
        //3단계
        if(new_id.contains("..")){
            do {
            new_id = new_id.replace("..",".");
        } while (new_id.contains(".."));
        }
        
        //4단계
        if (new_id.indexOf(".")==0){
            new_id = new_id.replaceFirst(".","");
        }
    
        if (new_id.lastIndexOf(".")==new_id.length()-1 && new_id.length()>=2){
            new_id=new_id.substring(0,new_id.length()-1);
        }
        
        //5단계
        if(new_id.length()<1){
            new_id = "aaa";
        }
        
        //6단계
        if(new_id.length()>=16){
           new_id = new_id.substring(0,15);
        }
        if(new_id.lastIndexOf(".")==new_id.length()-1&&new_id.length()>=2){
            new_id = new_id.substring(0,new_id.length()-1);
        }

        //7단계
        if(new_id.length()<=2 && new_id.length()>0){
            do{
                new_id += new_id.charAt(new_id.length()-1);
            }while(new_id.length()<3);
        }
        
        String answer = new_id;
        return answer;
    }
}