Merge branch 'main' into main

07- July/README.md

@@ -24,6 +24,7 @@
 1. **[Fair Distribution of Cookies](#01--fair-distribution-of-cookies)**
 1. **[Maximum Number of Achievable Transfer Requests](#02--maximum-number-of-achievable-transfer-requests)**
 1. **[Buddy Strings](#03--buddy-strings)**
+1. **[Single Number II](#04--single-number-ii)**
 
 <hr>
 <br><br>
@@ -211,4 +212,48 @@ public:
     }
 };
 ```
+
+<hr>
+<br><br>
+
+## 04)  [Single Number II](https://leetcode.com/problems/single-number-ii/)
+
+### Difficulty
+
+![](https://img.shields.io/badge/Medium-orange?style=for-the-badge)
+
+### Related Topic
+
+`Array` `Bit Manipulation`
+
+### Code
+
+
+```cpp
+class Solution {
+public:
+    int singleNumber(vector<int>& nums) {
+        // Variable to store the single number
+        int single = 0;
+
+        // Loop through each bit position from 0 to 31
+        for(int bits = 0, curr_bit = 0; bits < 32; bits++, curr_bit = 0) {
+            // Iterate over each element in the vector
+            for(auto& i : nums) {
+                // Check if the current bit is set in the element
+                if(i & (1ll << bits))
+                    curr_bit++;
+            }
+
+            // Check if the count of the current bit is not a multiple of 3
+            if(curr_bit % 3 == 1)
+                // Set the corresponding bit in the single variable
+                single |= (1 << bits);
+        }
+
+        // Return the single number
+        return single;
+    }
+};
+```