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  1. import java.io.BufferedReader;
  2. import java.io.BufferedWriter;
  3. import java.io.IOException;
  4. import java.io.InputStreamReader;
  5. import java.io.OutputStreamWriter;
  6.  
  7. public class Main {
  8. 	static char[][] str = null;
  9.  
  10. 	public static void main(String[] args) throws NumberFormatException, IOException {
  11.  
  12. 		BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
  13.         BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
  14.  
  15. 		int n = Integer.parseInt(bf.readLine()); // 3*2^k  (3, 6, 12, 24, 48, ...) (k<=10)
  16.  
  17. 		str = new char[n][2*n-1]; // x,y 2차원 그림판 ... 수직방향이 x축, 수평이 y축 임... 
  18.  
  19. 		drawStar(0,n-1,n);
  20.  
  21. 		for (int i = 0; i < n; i++) {
  22. 			bw.write(str[i]);
  23. 			bw.write('\n');
  24. 		}
  25.  
  26. 		bw.flush();
  27. 		bw.close();
  28.  
  29. 	}
  30.  
  31. 	/**
  32. 	 * 삼각형을 그리는 재귀함수
  33. 	 * @param x 삼각형을 꼭대기 x 좌표
  34. 	 * @param y 삼각형을 꼭대기 y 좌표
  35. 	 * @param n 삼각형 높이
  36. 	 */
  37. 	public static void drawStar(int x, int y, int n) {
  38. 		if (n == 3) {
  39. 			str[x][y] = '*'; // 1번째 줄
  40. 			str[x+1][y-1] = str[x+1][y+1] = '*'; // 2번째 줄
  41. 			str[x+2][y-2] = str[x+2][y-1] = str[x+2][y] = str[x+2][y+1] = str[x+2][y+2] = '*'; // 3번째줄
  42. 			return;
  43. 		}
  44.  
  45. 		drawStar(x,y,n/2);
  46. 		drawStar(x+ n/2,y-n/2,n/2);
  47. 		drawStar(x+ n/2,y+n/2,n/2);
  48. 	}
  49.  
  50. }
Success #stdin #stdout 0.04s 4575232KB
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stdout
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https://ideone.com/CNvJXb
language:
Java (HotSpot 12)
created:
6 years ago
visibility:
public

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