Create 2487. Remove Nodes From Linked List (#472)

Author: Chayandas07

2487. Remove Nodes From Linked List

@@ -0,0 +1,45 @@
+/**
+ * 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* removeNodes(ListNode* head) {
+        if(head->next == nullptr) {
+            return head;
+        }
+        ListNode* prevNode = head;
+        ListNode* currentNode = head->next;
+
+        while(currentNode != nullptr) {
+            ListNode* nextNode = currentNode->next;
+            currentNode->next = prevNode;
+            prevNode = currentNode;
+            currentNode = nextNode;
+        }
+        head->next = nullptr;
+        head = prevNode;
+
+        prevNode = head;
+        currentNode = head->next;
+        while(currentNode != nullptr) {
+            if(currentNode->val < prevNode->val) {
+                currentNode = currentNode->next;
+            } else {
+                ListNode* nextNode = currentNode->next;
+                currentNode->next = prevNode;
+                prevNode = currentNode;
+                currentNode = nextNode;
+            }   
+        }
+        head->next = nullptr;
+        head = prevNode;
+        return head;
+    }
+};