<span style="font-size:24px;">import java.util.*;
public class a5 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("请输入直角三角形的行数:");
int rows = input.nextInt();
for (int i = 1; i <= rows; i++) {//由第1行到第5行
for (int j = 0; j < rows + 1 - i; j++) {
System.out.print("*");
}
System.out.print("\n");
}
}
}</span>
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