백준 2742 / Java

<BufferedReader 버전>

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
 
public class Main{
 
    public static void main(String[] args) throws IOException {
    
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        
    
        int N = Integer.parseInt(bf.readLine());
        
        for(int i=N ; i>0 ; i--) {
            bw.write(i+"\n");
        }
        bw.flush();
        bw.close();
    }
}
 

import java.util.Scanner;
 
public class Main{
      
    public static void main(String[] args) {
         
        Scanner in = new Scanner(System.in);
 
        int N = in.nextInt();
        
        for(int i=N; i>0 ; i--) {
            System.out.println(i);
        }
        
        in.close();
                
    }  
 }
  
 

메모리/걸린시간

 

Scanner로 했을 때 보다 BufferedReader로 했을때 메모리와 시간 둘 다 절약 되었다. 호...