input: from typing import List
  
  
  def print_pattern_using_nested_loops(n: int) -> None:
      """ Print the following pattern using nested loops:
      1
      12
      123
      1234
      12345
      >>> print_pattern_using_nested_loops(5)
      1
      12
      123
      1234
      12345
      """
      
      for i in range(1, n + 1):
          for j in range(1, i + 1):
              print(j, end="")
          print()
output:     for i in range(1, n + 1):
          for j in range(1, i + 1):
              print(j, end="")
          print()