Java 11
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.BufferedWriter;
import java.io.OutputStreamWriter;
import java.io.IOException;
public class Main {
public static void main(String[] args) throws IOException {
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
int n = Integer.parseInt(br.readLine());
br.close();
for (int i=1; i<=n; i++) {
for (int j=1; j<=n-i; j++) {
bw.write(" ");
}
for (int k=1; k<=i; k++) {
bw.write("*");
}
bw.newLine();
}
bw.flush();
bw.close();
}
}