Unit 4.4 - Nested Iteration

4.4 Nested Iteration

How to iterate through something to get a time complexity of O(n^2)

for (int i = 1; i <= 3; i++) { // Outer loop
    System.out.println("Outer loop iteration: " + i);
    for (int j = 1; j <= 3; j++) { // Inner loop
        System.out.println("    Inner loop iteration: " + j);
    }
}

Outer loop iteration: 1
    Inner loop iteration: 1
    Inner loop iteration: 2
    Inner loop iteration: 3
Outer loop iteration: 2
    Inner loop iteration: 1
    Inner loop iteration: 2
    Inner loop iteration: 3
Outer loop iteration: 3
    Inner loop iteration: 1
    Inner loop iteration: 2
    Inner loop iteration: 3

What is wrong with this code cell(Hack)

import java.util.Scanner;
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the number of rows: ");
int rows = scanner.nextInt();
for (int i = rows; i>=1; i--) { // PROBLEM: I changed it to say i >= 1 instead of i > 1 so that it includes the last row (i=1)
    // Print numbers from 1 to i
    for (int j = 1; j <= i; j++) {
        System.out.print(j + " ");
    }
    // Move to next line after each row
    System.out.println();
}
        
scanner.close();

Enter the number of rows: 

Sample input: 5

Sample Output 1 2 3 4 5 1 2 3 4 1 2 3 1 2 1

Answer here: 5*4=20, Answer is B