improved code

[Anshv9616]

Variable Naming: Changed variable names to be more descriptive. For instance, nst (number of stars) is changed to row directly in the loop, making it clearer.

Simplified Loop: The inner loop directly uses the row index to determine how many values to print, reducing the need for an extra variable.

Update Logic: The val variable is updated at the end of each outer loop iteration, making it clearer how the starting number for each row is determined.

Scanner Closure: Added sc.close() to close the scanner, which is a good practice to prevent resource leaks.

User Prompt: Added a prompt before taking user input to enhance user experience.

These changes enhance readability and maintainability while keeping the core functionality intact. The overall complexity remains O(N^2) due to the nested loops, which is appropriate for this type of pattern generation.