How do you find the middle element of a singly linked list in C++?

How do you find the middle element of a singly linked list in C++?

In order to find middle element of linked list in one pass, you need to maintain two pointers, one increment at each node while other increments after two nodes at a time. By having this arrangement, when first pointer reaches end, second pointer will point to middle element of linked list.

How do you find the median in a linked list?

Simple approach

1. Traverse the linked list and count all elements.
2. if count is odd then again traverse the linked list and find n/2th element.
3. if count is even then again traverse the linked list and find: (n/2th element+ (n/2+1)th element)/2.

How do you add elements in the middle of a linked list?

Given a linked list containing n nodes. The problem is to insert a new node with data x at the middle of the list. If n is even, then insert the new node after the (n/2)th node, else insert the new node after the (n+1)/2th node.

How do you find the middle element of a list in Python?

“middle value of a list in python” Code Answer’s

1. def findMiddle(input_list):
2. middle = float(len(input_list))/2.
3. if middle % 2 != 0:
4. return input_list[int(middle – .5)]
5. else:
6. return (input_list[int(middle)], input_list[int(middle-1)])
7. ​

What is the fastest way to find the middle of a linked list?

Solution Steps

1. Create a pointer p , pointing to the head.
2. Iterate over the linked list until p reaches to the end of the linked list, thereby find the length of the list.
3. Set p to head again. Now, increment p length/2 times. Now, the p is at the middle of the linked list node. Return the value at p.

How to find middle element in linked list?

Given a singly linked list of N nodes. The task is to find middle of the linked list. For example, if given linked list is 1->2->3->4->5 then output should be 3. If there are even nodes, then there would be two middle nodes, we need to print second middle element. For example, if given linked list is 1->2->3->4->5->6 then output should be 4.

How to return middle node in linked list?

Middle of the Linked List. Easy. Add to List. Given a non-empty, singly linked list with head node head, return a middle node of linked list. If there are two middle nodes, return the second middle node. Example 1: Input: [1,2,3,4,5] Output: Node 3 from this list (Serialization: [3,4,5] ) The returned node has value 3.

How to move the mid element in a list?

Initialize mid element as head and initialize a counter as 0. Traverse the list from head, while traversing increment the counter and change mid to mid->next whenever the counter is odd. So the mid will move only half of the total length of the list. Thanks to Narendra Kangralkar for suggesting this method.

How to traverse a linked list in Java?

Traverse the whole linked list and count the no. of nodes. Now traverse the list again till count/2 and return the node at count/2. Traverse linked list using two pointers. Move one pointer by one and other pointer by two. When the fast pointer reaches end slow pointer will reach middle of the linked list.