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+## 1. Iteration
+
+::tabs-start
+
+```python
+class Solution:
+    def addBinary(self, a: str, b: str) -> str:
+        res = ""
+        carry = 0
+
+        a, b = a[::-1], b[::-1]
+        for i in range(max(len(a), len(b))):
+            digitA = ord(a[i]) - ord("0") if i < len(a) else 0
+            digitB = ord(b[i]) - ord("0") if i < len(b) else 0
+
+            total = digitA + digitB + carry
+            char = str(total % 2)
+            res = char + res
+            carry = total // 2
+
+        if carry:
+            res = "1" + res
+
+        return res
+```
+
+```java
+public class Solution {
+    public String addBinary(String a, String b) {
+        StringBuilder res = new StringBuilder();
+        int carry = 0;
+        
+        StringBuilder sa = new StringBuilder(a).reverse();
+        StringBuilder sb = new StringBuilder(b).reverse();
+        
+        for (int i = 0; i < Math.max(sa.length(), sb.length()); i++) {
+            int digitA = i < sa.length() ? sa.charAt(i) - '0' : 0;
+            int digitB = i < sb.length() ? sb.charAt(i) - '0' : 0;
+            
+            int total = digitA + digitB + carry;
+            char c = (char)((total % 2) + '0');
+            res.append(c);
+            carry = total / 2;
+        }
+        
+        if (carry > 0) {
+            res.append('1');
+        }
+        
+        return res.reverse().toString();
+    }
+}
+```
+
+```cpp
+class Solution {
+public:
+    string addBinary(string a, string b) {
+        string res = "";
+        int carry = 0;
+        
+        reverse(a.begin(), a.end());
+        reverse(b.begin(), b.end());
+        
+        for (int i = 0; i < max(a.length(), b.length()); i++) {
+            int digitA = i < a.length() ? a[i] - '0' : 0;
+            int digitB = i < b.length() ? b[i] - '0' : 0;
+            
+            int total = digitA + digitB + carry;
+            char c = (total % 2) + '0';
+            res += c;
+            carry = total / 2;
+        }
+        
+        if (carry) {
+            res += '1';
+        }
+        reverse(res.begin(), res.end());
+        return res;
+    }
+};
+```
+
+```javascript
+class Solution {
+    /**
+     * @param {string} a
+     * @param {string} b
+     * @return {string}
+     */
+    addBinary(a, b) {
+        let res = [];
+        let carry = 0;
+        
+        a = a.split("").reverse().join("");
+        b = b.split("").reverse().join("");
+        
+        for (let i = 0; i < Math.max(a.length, b.length); i++) {
+            const digitA = i < a.length ? a[i] - '0' : 0;
+            const digitB = i < b.length ? b[i] - '0' : 0;
+            
+            const total = digitA + digitB + carry;
+            const char = (total % 2).toString();
+            res.push(char)
+            carry = Math.floor(total / 2);
+        }
+        
+        if (carry) {
+            res.push('1');
+        }
+        res.reverse()
+        return res.join('');
+    }
+}
+```
+
+::tabs-end
+
+### Time & Space Complexity
+
+* Time complexity: $O(max(m, n))$
+* Space complexity: $O(m + n)$
+
+> Where $m$ and $n$ are the lengths of the strings $a$ and $b$ respectively.
+
+---
+
+## 2. Iteration (Optimal)
+
+::tabs-start
+
+```python
+class Solution:
+    def addBinary(self, a: str, b: str) -> str:
+        res = []
+        carry = 0
+
+        i, j = len(a) - 1, len(b) - 1
+        while i >= 0 or j >= 0 or carry > 0:
+            digitA = int(a[i]) if i >= 0 else 0
+            digitB = int(b[j]) if j >= 0 else 0
+
+            total = digitA + digitB + carry
+            res.append(total % 2)
+            carry = total // 2
+
+            i -= 1
+            j -= 1
+
+        res.reverse()
+        return ''.join(map(str, res))
+```
+
+```java
+public class Solution {
+    public String addBinary(String a, String b) {
+        StringBuilder res = new StringBuilder();
+        int carry = 0;
+
+        int i = a.length() - 1, j = b.length() - 1;
+        while (i >= 0 || j >= 0 || carry > 0) {
+            int digitA = i >= 0 ? a.charAt(i) - '0' : 0;
+            int digitB = j >= 0 ? b.charAt(j) - '0' : 0;
+
+            int total = digitA + digitB + carry;
+            res.append(total % 2);
+            carry = total / 2;
+
+            i--;
+            j--;
+        }
+
+        return res.reverse().toString();
+    }
+}
+```
+
+```cpp
+class Solution {
+public:
+    string addBinary(string a, string b) {
+        string res = "";
+        int carry = 0;
+
+        int i = a.size() - 1, j = b.size() - 1;
+        while (i >= 0 || j >= 0 || carry > 0) {
+            int digitA = i >= 0 ? a[i] - '0' : 0;
+            int digitB = j >= 0 ? b[j] - '0' : 0;
+
+            int total = digitA + digitB + carry;
+            res += (total % 2) + '0';
+            carry = total / 2;
+
+            i--;
+            j--;
+        }
+
+        reverse(res.begin(), res.end());
+        return res;
+    }
+};
+```
+
+```javascript
+class Solution {
+    /**
+     * @param {string} a
+     * @param {string} b
+     * @return {string}
+     */
+    addBinary(a, b) {
+        let res = [];
+        let carry = 0;
+
+        let i = a.length - 1, j = b.length - 1;
+        while (i >= 0 || j >= 0 || carry > 0) {
+            const digitA = i >= 0 ? a[i] - "0" : 0;
+            const digitB = j >= 0 ? b[j] - "0" : 0;
+
+            const total = digitA + digitB + carry;
+            res.push(total % 2);
+            carry = Math.floor(total / 2);
+
+            i--;
+            j--;
+        }
+        res.reverse()
+        return res.join('');
+    }
+}
+```
+
+::tabs-end
+
+### Time & Space Complexity
+
+* Time complexity: $O(max(m, n))$
+* Space complexity: $O(max(m, n))$
+
+> Where $m$ and $n$ are the lengths of the strings $a$ and $b$ respectively.