LeetCode #67 Add Binary 🚀 | Binary Addition Interview Trick in Java #coding #programming #leetcode

Solved LeetCode #67: Add Binary using an efficient string manipulation approach in Java.

Instead of converting binary strings to integers, we perform binary addition manually, just like elementary-school addition, making the solution work even for very large inputs.

✅ String Manipulation
✅ Binary Arithmetic
✅ Carry Handling Logic
✅ O(n) Time Complexity
✅ FAANG Interview Favorite

Example 1:

Input:
a = "11"

b = "1"

Output:
"100"

Example 2:

Input:
a = "1010"

b = "1011"

Output:
"10101"

The key idea:

✔ Start from the last character of both strings

✔ Add bits and carry

✔ Store sum % 2

✔ Update carry using sum / 2

✔ Reverse the final result

This is a classic interview problem that teaches how to work with large numbers represented as strings.

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