844 - Backspace String Compare

#easy

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".

class Solution {
public:
    bool backspaceCompare(string s, string t) {
        return reBuild(s) == reBuild(t);
    }

    vector<char> reBuild( string input ) {
        vector<char> result;
        for ( int i = 0; i < input.size(); i++ ) {
            if ( input[i] != '#' ) result.push_back( input[i] );
            else if ( !result.empty() ) result.pop_back();
        }

        return result;
    }


};