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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
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