Create swapping_nodes_in_linked_list.cpp

Author: avidLearnerInProgress

swapping_nodes_in_linked_list.cpp

@@ -0,0 +1,34 @@
+/**
+ * Definition for singly-linked list.
+ * struct ListNode {
+ *     int val;
+ *     ListNode *next;
+ *     ListNode() : val(0), next(nullptr) {}
+ *     ListNode(int x) : val(x), next(nullptr) {}
+ *     ListNode(int x, ListNode *next) : val(x), next(next) {}
+ * };
+ */
+class Solution {
+public:
+    ListNode* swapNodes(ListNode* head, int k) {
+        if(k == 0) return head;
+        
+        ListNode *slow, *kthBegin, *fast = head;
+        
+        for(int i = 0; i < k; i++) {
+            kthBegin = fast;
+            fast = fast->next;
+        }
+        
+        slow = head;    
+        while(fast) {
+            slow = slow->next;
+            fast = fast->next;
+        }
+        cout<<kthBegin->val<<" "<<slow->val<<" ";
+        swap(slow->val, kthBegin->val);
+
+        return head;
+       
+    }
+};