1508 : 나도 IQ 150

import java.util.Scanner;

public class _1508 {
	public static void main(String[] args) {
		Scanner stdIn = new Scanner(System.in);
		int x = stdIn.nextInt();
		
		int[][] a = new int[20][20];
		for(int i=0; i<x;i++) {
			a[i][0]= stdIn.nextInt();
		}
		
		for(int i =0;i<x;i++){
			for(int j=0;j<=i;j++) {
					a[i+1][j+1] = a[i+1][j] - a[i][j];	
			}
		}
		
		for(int i =0;i<x;i++) {
			for(int j=0;j<=i;j++) {
				System.out.print(a[i][j]+" ");
			}
			System.out.println();
		}
	}
}
Java
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