Added Odd Even Linked List

CMakeLists.txt

@@ -1272,4 +1272,15 @@ add_executable(NumberOfGoodPairs
 target_link_libraries(
         NumberOfGoodPairs
         GTest::gtest_main
+)
+
+# Odd Even Linked List
+add_executable(OddEvenLinkedList
+        Medium/OddEvenLinkedList/include/solution.hpp
+        Medium/OddEvenLinkedList/tests/test.cpp
+)
+
+target_link_libraries(
+        OddEvenLinkedList
+        GTest::gtest_main
 )

Medium/OddEvenLinkedList/include/solution.hpp

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <vector>
+#include <iostream>
+#include <algorithm>
+#include <gtest/gtest.h>
+
+struct ListNode {
+    int32_t value;
+    ListNode *next;
+};
+
+class Solution {
+public:
+    static auto odd_even_list(ListNode *head) -> ListNode* {
+       if (head == nullptr) return nullptr;
+
+       ListNode *odd = head;
+       ListNode *even = head->next;
+       ListNode *even_head = head->next;
+
+       while (even && even->next) {
+           odd->next = odd->next->next;
+           even->next = even->next->next;
+           odd = odd->next;
+           even = even->next;
+       }
+
+       odd->next = even_head;
+       return head;
+    }
+
+    static auto insert(ListNode **head_ref,
+                       const int32_t new_value) -> void {
+        auto *node = new ListNode();
+        node->value = new_value;
+        node->next = (*head_ref);
+        (*head_ref) = node;
+    }
+
+    static auto print(ListNode *head) -> void {
+        while (head != nullptr) {
+            std::cout << head->value << ' ';
+            head = head->next;
+        }
+    }
+};

Medium/OddEvenLinkedList/tests/test.cpp

@@ -0,0 +1,17 @@
+#include "../include/solution.hpp"
+
+auto main() -> int {
+    ListNode *node = nullptr;
+    Solution::insert(&node, 5);
+    Solution::insert(&node, 4);
+    Solution::insert(&node, 3);
+    Solution::insert(&node, 2);
+    Solution::insert(&node, 1);
+
+    Solution::print(node);
+    std::cout << '\n';
+    node = Solution::odd_even_list(node);
+    Solution::print(node);
+
+    return 0;
+}