Looping

Suggestions:

• Given a string, find the length of the longest substring without repeating characters:

  • Input: s = "abcabcbb"

  • Output: 3

• Given a string, reverse its characters:

  • Input: s = "Jane"

  • Output: enaJ

• Given a positive integer, print the following:

  • Input: 3

  • Output:
    1
    1 2
    1 2 3
    1 2 3 4

• Count the total number of digits in a number:

  • Input: 75869

  • Output: 5

• Find the sum of the 2s series up to n terms:

  • Input: 5

  • Output: 2 + 22 + 222 + 2222 + 22222 = 24690