odd-even linked list #146
odd-even linked list #146
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WalkthroughA new C++ program implements a linked list with an odd-even reordering operation. The LinkedList class provides insertion, reordering, and printing functionality. The oddEven method rearranges nodes so odd-positioned nodes appear first, followed by even-positioned nodes, each group preserving relative order. Changes
Sequence DiagramsequenceDiagram participant Main participant LinkedList participant Node Main->>LinkedList: insert(1..5) LinkedList->>Node: Create nodes and link Note over LinkedList: head → 1 → 2 → 3 → 4 → 5 Main->>LinkedList: print() LinkedList->>Main: Display: 1 → 2 → 3 → 4 → 5 Main->>LinkedList: oddEven() rect rgb(230, 245, 230) Note over LinkedList: Separate odd positions (1,3,5) from even (2,4) LinkedList->>LinkedList: Rearrange: odd nodes linked together LinkedList->>LinkedList: Keep even nodes linked separately LinkedList->>LinkedList: Concatenate odd list with even list end Note over LinkedList: head → 1 → 3 → 5 → 2 → 4 Main->>LinkedList: print() LinkedList->>Main: Display: 1 → 3 → 5 → 2 → 4 Estimated code review effort🎯 2 (Simple) | ⏱️ ~12 minutes
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Pre-merge checks and finishing touches❌ Failed checks (1 warning)
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✨ Finishing touches
🧪 Generate unit tests (beta)
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Actionable comments posted: 1
🧹 Nitpick comments (4)
Q) Linked List/odd-even-linkedlist.cpp (4)
3-4: Consider avoidingusing namespace std;in global scope.While acceptable for small programs, it's better practice to use explicit
std::prefixes or limit the scope of the using declaration to avoid name collisions.
14-14: Consider makingheadprivate to preserve encapsulation.Exposing
headas public allows external code to directly manipulate the internal structure, potentially breaking invariants. Making it private and providing controlled access through methods would be more robust.
18-28: Consider maintaining a tail pointer for O(1) insertion.The current implementation traverses the entire list for each insertion (O(n)). Maintaining a tail pointer would allow O(1) append operations.
47-54: Consider making this method const.Since
print()doesn't modify the list, marking it asconstwould better express intent and allow it to be called on const LinkedList objects.- void print() { + void print() const {
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Q) Linked List/odd-even-linkedlist.cpp(1 hunks)
🧰 Additional context used
🪛 Clang (14.0.6)
Q) Linked List/odd-even-linkedlist.cpp
[error] 3-3: 'iostream' file not found
(clang-diagnostic-error)
🔇 Additional comments (3)
Q) Linked List/odd-even-linkedlist.cpp (3)
6-10: LGTM!The Node struct is well-implemented with proper initialization.
30-45: LGTM!The oddEven algorithm is correctly implemented. It properly handles edge cases (empty, single node) and correctly rearranges the linked list to group odd-positioned nodes before even-positioned nodes while preserving relative order.
57-74: LGTM!The main function clearly demonstrates the odd-even reordering functionality with a simple test case.
| class LinkedList { | ||
| public: | ||
| Node* head; | ||
| | ||
| LinkedList() : head(nullptr) {} |
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Add destructor and implement rule of five to prevent memory leaks and undefined behavior.
The class manages dynamic memory but lacks:
- A destructor to free allocated nodes (causes memory leak)
- Copy constructor and copy assignment operator (can cause double-free)
- Move constructor and move assignment operator (optional but recommended)
Add a destructor to properly clean up:
+ ~LinkedList() { + Node* current = head; + while (current) { + Node* next = current->next; + delete current; + current = next; + } + } + + // Prevent copying (or implement proper deep copy) + LinkedList(const LinkedList&) = delete; + LinkedList& operator=(const LinkedList&) = delete;🤖 Prompt for AI Agents
In Q) Linked List/odd-even-linkedlist.cpp around lines 12 to 16, the LinkedList class manages heap nodes but has no destructor or special-member functions; implement the Rule of Five: add a destructor that iterates the list and deletes all nodes, implement a deep-copy copy constructor and copy assignment operator that allocate new nodes copying values and preserve list order (use the copy-and-swap idiom for assignment), and implement move constructor and move assignment that take ownership of the head pointer and set the source.head to nullptr (mark moves noexcept). Ensure all paths free previous resources before reassigning to avoid leaks and double-free. 
AnkitMajee added enhancement 
| @Samya-Agg Merged |
2 participants
C++ code to reorder all odd-positioned nodes together followed by all even-positioned nodes.
-Maintain two pointers:
odd → points to the first node.
even → points to the second node.
-Move odd and even pointers alternatively.
-Then, link the end of the odd list to the start of the even list.
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