[BaekJoon] 27423번 녹색거탑 문제 풀이 (Success)

24723번: 녹색거탑

 

☕Language: Java

 

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 {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 
        int i = Integer.parseInt(br.readLine());
        bw.write((int)(Math.pow(2, i))+"");
 
        bw.flush();
        bw.close();
 
    }
}
 

🤔 해설

1. Math.pow(2, i)

    - 2의 i승

 

😮 이 외의 풀이

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 {
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
 
        int N = Integer.parseInt(br.readLine());
 
        int sum = 1;
        for (int i = 0; i < N; i++) {
            sum *= 2;
        }
 
        bw.write(sum + "");
 
        bw.flush();
        bw.close();
    }
}
 

 

 

 

🔗 소스 코드
GitHub

 

📚 참고 자료

[백준 알고리즘] 백준 24723번 녹색거탑 자바(JAVA)