Print Right Half Pyramid Star Pattern

Given an integer N, print a right half pyramid star pattern with N rows. The first row has 1 star, the second row has 2 stars, and each next row has one more star than the previous row. The Nth row has N stars, and all stars are left aligned.

Examples:

Input: N = 3
Output:
*
**
***

Input: N = 5
Output:
*
**
***
****
*****

Using Nested Loops – O(N²) Time and O(1) Space

The pattern can be printed using two nested loops, where the outer loop controls the rows and the inner loop prints i stars in the i-th row.

Step-by-step approach:

• Run an outer loop from 1 to N to represent each row.
• For each row i, run an inner loop from 1 to i.
• Print a star (*) during each iteration of the inner loop.
• After printing the stars for the current row, print a newline to move to the next row.
• Repeat this process until all N rows are printed.

using namespace std;

int main()
{

    int N = 5;

    // Outer loop runs N times, once for each row
    for (int i = 1; i <= N; i++) {
        // Inner loop prints 'i' stars
        for (int j = 1; j <= i; j++) {
            cout << "*";
        }

        cout << "\n";
    }

    return 0;
}

public class GFG {
    public static void main(String[] args)
    {


        int N = 5;

        // Outer loop runs N times, once for each row
        for (int i = 1; i <= N; i++) {
            // Inner loop prints 'i' stars
            for (int j = 1; j <= i; j++) {
                System.out.print("*");
            }
       
            System.out.println();
        }
    }
}

def main():

    N = 5

    # Outer loop runs N times, once for each row
    for i in range(1, N + 1):
        # Inner loop prints 'i' stars
        for j in range(1, i + 1):
            print("*", end="")
     
        print()


if __name__ == "__main__":
    main()

using System;

class GFG
{
    static void Main()
    {
    
        int N = 5;

        // Outer loop runs N times, once for each row
        for (int i = 1; i <= N; i++)
        {
            // Inner loop prints 'i' stars
            for (int j = 1; j <= i; j++)
            {
                Console.Write("*");
            }

            Console.WriteLine();
        }
    }
}

let N = 5;

// Outer loop runs N times, once for each row
for (let i = 1; i <= N; i++) {
    // Inner loop prints 'i' stars
    for (let j = 1; j <= i; j++) {
        process.stdout.write("*");
    }
   
    console.log();
}

*
**
***
****
*****