public static void main(String[] args) {
System.out.println("输入三角形的行数");
Scanner scanner = new Scanner(System.in);
int n = scanner.nextInt();
for (int i = 0; i < n; i++) {
for (int x = i + 1; x < n; x++) {
System.out.print(" ");
}
for (int y = 0; y < (i + 1) * 2 - 1; y++) {
System.out.print("*");
}
System.out.print('
');
}
}