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Day 10

Day 10: Advanced Linked List Operations and Problems

10/60 Days

Advanced Linked List Operations and Problems #

Welcome to Day 10 of our 60 Days of Coding Algorithm Challenge! Today, we’ll explore advanced operations and tackle common problems related to linked lists. These topics are frequently encountered in coding interviews and real-world applications.

1. Reversing a Linked List #

Reversing a linked list is a fundamental operation that’s often asked in interviews. Here’s an implementation for a singly linked list:

1def reverse_linked_list(self):
2    prev = None
3    current = self.head
4    while current:
5        next_node = current.next
6        current.next = prev
7        prev = current
8        current = next_node
9    self.head = prev

Time Complexity: O(n), where n is the number of nodes in the list.

2. Detecting a Cycle in a Linked List #

The Floyd’s Cycle-Finding Algorithm, also known as the “tortoise and hare” algorithm, is an efficient method to detect cycles:

 1def has_cycle(self):
 2    if not self.head:
 3        return False
 4    
 5    slow = self.head
 6    fast = self.head.next
 7    
 8    while slow != fast:
 9        if not fast or not fast.next:
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