Swap Nodes in Pairs LeetCode Problem | LeetCode Problems For Beginners | LeetCode Problems & Solutions | Improve Problem Solving Skills | LeetCode Problems Java | LeetCode Problems C++
Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.
In this post, you will find the solution for the Swap Nodes in Pairs in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.
Use “Ctrl+F” To Find Any Questions Answer. & For Mobile User, You Just Need To Click On Three dots In Your Browser & You Will Get A “Find” Option There. Use These Option to Get Any Random Questions Answer.
About LeetCode
LeetCode is one of the most well-known online judge platforms to help you enhance your skills, expand your knowledge and prepare for technical interviews.
LeetCode is for software engineers who are looking to practice technical questions and advance their skills. Mastering the questions in each level on LeetCode is a good way to prepare for technical interviews and keep your skills sharp. They also have a repository of solutions with the reasoning behind each step.
LeetCode has over 1,900 questions for you to practice, covering many different programming concepts. Every coding problem has a classification of either Easy, Medium, or Hard.
LeetCode problems focus on algorithms and data structures. Here is some topic you can find problems on LeetCode:
- Mathematics/Basic Logical Based Questions
- Arrays
- Strings
- Hash Table
- Dynamic Programming
- Stack & Queue
- Trees & Graphs
- Greedy Algorithms
- Breadth-First Search
- Depth-First Search
- Sorting & Searching
- BST (Binary Search Tree)
- Database
- Linked List
- Recursion, etc.
Leetcode has a huge number of test cases and questions from interviews too like Google, Amazon, Microsoft, Facebook, Adobe, Oracle, Linkedin, Goldman Sachs, etc. LeetCode helps you in getting a job in Top MNCs. To crack FAANG Companies, LeetCode problems can help you in building your logic.
Link for the Problem – Swap Nodes in Pairs– LeetCode Problem
Swap Nodes in Pairs– LeetCode Problem
Problem:
Given a linked list, swap every two adjacent nodes and return its head. You must solve the problem without modifying the values in the list’s nodes (i.e., only nodes themselves may be changed.)
Example 1:
![Swap Nodes in Pairs LeetCode Programming Solutions | LeetCode Problem Solutions in C++, Java, & Python [💯Correct] 2](https://assets.leetcode.com/uploads/2020/10/03/swap_ex1.jpg)
Input: head = [1,2,3,4] Output: [2,1,4,3]
Example 2:
Input: head = [] Output: []
Example 3:
Input: head = [1] Output: [1]
Constraints:
- The number of nodes in the list is in the range
[0, 100]
. 0 <= Node.val <= 100
Swap Nodes in Pairs– LeetCode Solutions
class Solution { public: ListNode* swapPairs(ListNode* head) { const int length = getLength(head); ListNode dummy(0, head); ListNode* prev = &dummy; ListNode* curr = head; for (int i = 0; i < length / 2; ++i) { ListNode* next = curr->next; curr->next = next->next; next->next = prev->next; prev->next = next; prev = curr; curr = curr->next; } return dummy.next; } private: int getLength(ListNode* head) { int length = 0; for (ListNode* curr = head; curr; curr = curr->next) ++length; return length; } };
class Solution { public ListNode swapPairs(ListNode head) { final int length = getLength(head); ListNode dummy = new ListNode(0, head); ListNode prev = dummy; ListNode curr = head; for (int i = 0; i < length / 2; ++i) { ListNode next = curr.next; curr.next = next.next; next.next = curr; prev.next = next; prev = curr; curr = curr.next; } return dummy.next; } private int getLength(ListNode head) { int length = 0; for (ListNode curr = head; curr != null; curr = curr.next) ++length; return length; } }
class Solution: def swapPairs(self, head: ListNode) -> ListNode: def getLength(head: ListNode) -> int: length = 0 while head: length += 1 head = head.next return length length = getLength(head) dummy = ListNode(0, head) prev = dummy curr = head for _ in range(length // 2): next = curr.next curr.next = next.next next.next = prev.next prev.next = next prev = curr curr = curr.next return dummy.next
tadalafil 10mg for sale buy tadalafil 20mg generic buy ed pills tablets
order duricef 250mg pill buy epivir no prescription order finasteride 5mg generic
buy fluconazole generic order fluconazole 100mg online cheap buy cipro without a prescription
estrace order online buy lamictal generic cost minipress 1mg
vermox for sale online buy tretinoin pills for sale tadalis pills
order cleocin 150mg for sale pills for erection order sildenafil 50mg generic
avana 100mg uk avana 200mg cost buy diclofenac 50mg for sale
order indocin 50mg without prescription purchase terbinafine without prescription cefixime 200mg over the counter
order tamoxifen 10mg pill ceftin 500mg canada cefuroxime 500mg over the counter
order trimox 250mg buy clarithromycin how to get clarithromycin without a prescription
careprost uk buy bimatoprost cheap generic trazodone 100mg
clonidine 0.1 mg uk buy antivert 25 mg without prescription spiriva 9 mcg generic
suhagra usa sildenafil 100mg oral buy generic sildalis online
buy minocycline generic minocycline 50mg pill pioglitazone pills
isotretinoin 10mg oral order zithromax 250mg without prescription purchase zithromax generic
arava oral buy arava for sale cheap azulfidine 500mg
order azipro 250mg pills buy omnacortil 10mg generic order gabapentin online
order cialis 10mg without prescription cheapest viagra tadalafil 5mg price
stromectol covid cheapest ed pills online cheap deltasone 40mg
lasix 40mg tablet order furosemide antihistamine tablets
order vardenafil sale purchase levitra for sale order hydroxychloroquine 400mg online
altace usa altace 5mg tablet order arcoxia pills
vardenafil sale vardenafil uk hydroxychloroquine 200mg canada
order asacol 400mg online cheap mesalamine without prescription irbesartan drug