Create 206. Reverse Linked List (#435)

Author: Chayandas07

206. Reverse Linked List

@@ -0,0 +1,28 @@
+/**
+ * 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* reverseList(ListNode* head) {
+        if(!head)return head;
+        ListNode* prev=NULL;
+        ListNode* curr=head;
+        ListNode* leader;
+
+        while(curr!=NULL){
+            leader=curr->next;
+            curr->next=prev;
+            prev=curr;
+            curr=leader;
+        }
+
+        return prev;
+    }
+};