LeetCode 67: Add Binary - Python Solution in 3 Minute

Описание: We need to add two binary strings and return their sum as a binary string.
You cannot convert the strings directly to integers — simulate the addition like you would by hand.

✅ How we solve it:

We use two pointers starting from the end of each string and a carry variable:

Move from right to left (least significant to most significant bit).

Add corresponding digits from both strings along with the carry.

Append the current digit to the result (total % 2).

Update the carry (total // 2).

Reverse the result at the end since digits were appended backwards.

This simulates binary addition in-place, runs efficiently in O(n) time and O(n) space.

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