0844. Backspace String Compare

https://leetcode.com/problems/backspace-string-compare

Description

Given two strings s and t, return true 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".

Constraints:

• 1 <= s.length, 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?

ac