[백준/JAVA] 별 찍기 시리즈

 

목차

 

 

🔺 2438번: 별 찍기 - 1

https://www.acmicpc.net/problem/2438

2438번: 별 찍기 - 1

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
        
        for(int i = 1 ; i <= N ; i++) {
            sb.append("*".repeat(i)).append("\n");
        }
        System.out.println(sb);
    }
}
 

 

 

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🔺 2439번: 별 찍기 - 2

https://www.acmicpc.net/problem/2439

2439번: 별 찍기 - 2

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
 
        for(int i = 1 ; i <= N ; i++) {
            sb.append(" ".repeat(N - i));
            sb.append("*".repeat(i));
            sb.append("\n");
        }
 
        System.out.println(sb);
    }
}
 

 

 

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🔺 2440번: 별 찍기 - 3

https://www.acmicpc.net/problem/2440

2440번: 별 찍기 - 3

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
 
        for(int i = N ; i >= 1 ; i--) {
            sb.append("*".repeat(i)).append("\n");
        }
 
        System.out.println(sb);
    }
}
 

 

 

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🔺 2441번: 별 찍기 - 4

https://www.acmicpc.net/problem/2441

2441번: 별 찍기 - 4

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
 
        for(int i = N ; i >= 1 ; i--) {
            sb.append(" ".repeat(N - i)); // 띄어쓰기
            sb.append("*".repeat(i)); // 별
            sb.append("\n");
        }
 
        System.out.println(sb);
    }
}
 

 

 

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🔺 2442번: 별 찍기 - 5

https://www.acmicpc.net/problem/2442

2442번: 별 찍기 - 5

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
 
        for(int i = 1 ; i <= N ; i++) {
            sb.append(" ".repeat(N - i));            // 띄어쓰기
            sb.append("*".repeat(2*(i - 1) + 1));    // 별
            sb.append("\n");
        }
 
        System.out.println(sb);
    }
}
 

 

 

 

🔺 2443번: 별 찍기 - 6

https://www.acmicpc.net/problem/2443

2443번: 별 찍기 - 6

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
 
        for(int i = 1 ; i <= N ; i++) {
            sb.append(" ".repeat(i - 1));           // 띄어쓰기 (0 1 2 3 4)
            sb.append("*".repeat(2*(N - i) + 1));   // 별 (9 7 5 3 1)
            sb.append("\n");
        }
 
        System.out.println(sb);
    }
}
 

 

 

 

🔺 2444번: 별 찍기 - 7

https://www.acmicpc.net/problem/2444

2444번: 별 찍기 - 7

import java.util.*;
import java.io.*;
 
public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuilder sb = new StringBuilder();
        
        int N = Integer.parseInt(br.readLine());
 
        for(int i = 1 ; i <= N - 1 ; i++) {          // 🔔 N - 1번 해야 마지막 줄 중복 출력 안 됨 🔔
            sb.append(" ".repeat(N - i));            // 띄어쓰기
            sb.append("*".repeat(2*(i - 1) + 1));    // 별
            sb.append("\n");
        }
        
        for(int i = 1 ; i <= N ; i++) {
            sb.append(" ".repeat(i - 1));           // 띄어쓰기
            sb.append("*".repeat(2*(N - i) + 1));   // 별
            sb.append("\n");
        }
 
        System.out.println(sb);
    }
}
 

💬 별 찍기 5와 6을 합치면 된다.