Given two strings S and T, return if they are equal when both are typed into empty text editors. # means a backspace character.

Note that after backspacing an empty text, the text will continue empty.

Example 1:

Input: S = “ab#c”, T = “ad#c” Output: true Explanation: Both S and T become “ac”.

Example 2:

Input: S = “ab##”, T = “c#d#” Output: true Explanation: Both S and T become “”.

Example 3:

Input: S = “a##c”, T = “#a#c” Output: true Explanation: Both S and T become “c”.

Example 4:

Input: S = “a#c”, T = “b” Output: false Explanation: S becomes “c” while T becomes “b”.

Note:

  • 1 <= S.length <= 200
  • 1 <= T.length <= 200
  • S and T only contain lowercase letters and ‘#’ characters.

Follow up:

  • Can you solve it in O(N) time and O(1) space?
Code

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