[Solved] Given two strings s and t, return true if they are equal when both are typed into empty text editors. ‘#’ means a backspace character.

Question

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 = "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?

Python Solution

class Solution:
    def backspaceCompare(self, S: str, T: str) -> bool:
        def bckspc(string):
            stack=[]
            for i in string:
                if i =='#':
                    try:
                        stack.pop()
                    except:
                        pass
                else:
                    stack.append(i)
            return ''.join(stack)

        return (bckspc(S)==bckspc(T))
Abhishek Sharma
Abhishek Sharma

Started my Data Science journey in my 2nd year of college and since then continuously into it because of the magical powers of ML and continuously doing projects in almost every domain of AI like ML, DL, CV, NLP.

Articles: 520

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