Create 1474.Delete-N-Nodes-After-M-Nodes-of-a-Linked-List.cpp

rkSingh37 · Jul 14, 2020 · 2323d4e · 2323d4e
1 parent a29109d
commit 2323d4e
Showing 1 changed file with 47 additions and 0 deletions.
diff --git a/...des-After-M-Nodes-of-a-Linked-List/1474.Delete-N-Nodes-After-M-Nodes-of-a-Linked-List.cpp b/...des-After-M-Nodes-of-a-Linked-List/1474.Delete-N-Nodes-After-M-Nodes-of-a-Linked-List.cpp
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+/**
+ * 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* deleteNodes(ListNode* head, int m, int n) 
+    {
+        ListNode* p = head;
+        while (p)
+        {
+            for (int i=0; i<m-1; i++)
+            {
+                p = p->next;
+                if (!p) break;
+            }
+
+            if (!p) break;
+
+            ListNode* q = p;            
+            for (int i=0; i<n; i++)
+            {
+                q = q->next;
+                if (!q) break;
+            }
+            if (!q)
+            {
+                p->next = NULL;
+                break;
+            }
+            else
+            {
+                p->next = q->next;
+                p = p->next;                
+            }
+        }
+
+        return head;
+
+    }
+};