[코테] 4. 단어뒤집기

내 정답

import java.util.*;

class Main{
 public static String solution(String input, int N){
    String result ="";
       for(int j=input.length()-1;j>=0;j--){
            result+=input.charAt(j);
        }
      return result;
   }



  public static void main(String[] args){
    Scanner kb = new Scanner(System.in);
    int N = kb.nextInt();
    String[] arr = new String[N];
    for(int i=0;i<N;i++){
       String input = kb.next();
       arr[i] = input;
    }
    for(int i=0;i<N;i++){
    System.out.println(solution(arr[i],N));
    }
 }

}

강의 정답 1

import java.util.*;

class Main{
  pulic ArrayList<String> solution (int n, String[] str){
     ArrayLsit<String> answer = new ArrayList<>();
     for(String x: str){
       String tmp = new StringBuilder(x).reverse().toString();
       answer.add(tmp);
     
     }
     return answer;
  
  
  }
  
  public static void main(String[] args){
    Main T = new Main();
    Scanner kb = new Scanner(System.in);
    int n = kb.nextInt();
    String[] str = new Strint[n];
    for(String x : T.solution(n,str)){
      System.out.println(x);
    }  
  }

}

StringBuilder이해하기 추가

강의 정답 2

import java.util.*;

public class p4 {
  public static ArrayList<String> solution(int n, String[] str){
	  ArrayList<String> answer = new ArrayList<>();
	  for(String x : str) {
		  char[] s = x.toCharArray();
		  int lt =0, rt=x.length()-1;
		  while(lt<rt) {
			  char tmp=s[lt];
			  s[lt]=s[rt];
			  s[rt]=tmp;
			  lt++;
			  rt--;
		  }
		  String tmp = String.valueOf(s);
		  answer.add(tmp);
	  }
	  return answer;
	  
  }
	
  public static void main(String[] args) {
	  Scanner kb = new Scanner(System.in);
	  int n = kb.nextInt();
	  String[] str = new String[n];
	  for(int i=0;i<n;i++) {
		  String in = kb.next();
		  str[i]=in;
	  }
	  for(String x : solution(n,str)) {
		  System.out.println(x);
	  }
	      
  }
  
}