From ba659118a8ab6fa88a18cc2ad229a6fab5a63363 Mon Sep 17 00:00:00 2001
From: pallavipriya4321 <56637207+pallavipriya4321@users.noreply.github.com>
Date: Tue, 5 Oct 2021 23:40:34 +0530
Subject: [PATCH] Delete a node from middle of linked list

---
 Delete_middle_of_a_linked_lists.cpp | 108 ++++++++++++++++++++++++++++
 1 file changed, 108 insertions(+)
 create mode 100644 Delete_middle_of_a_linked_lists.cpp

diff --git a/Delete_middle_of_a_linked_lists.cpp b/Delete_middle_of_a_linked_lists.cpp
new file mode 100644
index 0000000..8dc7567
--- /dev/null
+++ b/Delete_middle_of_a_linked_lists.cpp
@@ -0,0 +1,108 @@
+#include <bits/stdc++.h> 
+using namespace std; 
+
+struct Node
+{
+    int data;
+    struct Node* next;
+    
+    Node(int x){
+        data = x;
+        next = NULL;
+    }
+};
+
+/* Function to get the middle of the linked list*/
+struct Node *deleteMid(struct Node *head);
+void printList(Node* node) 
+{ 
+	while (node != NULL) { 
+		cout << node->data <<" "; 
+		node = node->next; 
+	}  
+	cout<<"\n";
+} 
+int main() 
+{ 
+	int t;
+	cin>>t;
+	while(t--)
+	{
+		int n;
+		cin>>n;
+
+		int data;
+		cin>>data;
+		struct Node *head = new Node(data);
+		struct Node *tail = head;
+		for (int i = 0; i < n-1; ++i)
+		{
+			cin>>data;
+			tail->next = new Node(data);
+			tail = tail->next;
+		}
+		head = deleteMid(head);
+		printList(head); 
+	}
+	return 0; 
+} 
+
+
+// } Driver Code Ends
+
+
+
+/* Link list Node:
+
+struct Node
+{
+    int data;
+    struct Node* next;
+
+    Node(int x){
+        data = x;
+        next = NULL;
+    }
+};
+
+*/
+
+// Deletes middle of linked list and returns head of the modified list
+Node* deleteMid(Node* head)
+{
+    // Your Code Here
+  struct Node *ptr=head,*pre;
+  int c=0;
+   while(ptr!=NULL)
+   {
+       c++;
+       ptr=ptr->next;
+   }
+   if(head==NULL || c==1)
+        return NULL;
+    
+   if(c%2==1)
+        c=(c+1)/2;
+    else
+        c=(c/2)+1;
+    ptr=head;
+    pre=ptr;
+    int i=0;
+    while(1)
+    {
+        i++;
+        if(i==c)
+        {
+            pre->next=ptr->next;
+            free(ptr);
+            break;
+        }
+        else
+        {
+            pre=ptr;
+            ptr=ptr->next;
+        }
+    }
+    return head;
+    
+}
\ No newline at end of file