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The problem involves verifying the presence of a closed loop within a sequence of connected nodes. Specifically, one must determine if traversing the next pointers eventually returns to a previously encountered node. While test environments may define connection indices for simulation purposse, the algorithm operates logically without reliance ...

get(index): Get the value of the index-th node in the linked list. If the index is invalid, return -1. addAtHead(val): Add a node of value val before the first element of the linked list. After the insertion, the new node will be the first node of the linked list. addAtTail(val): Append a node of value val as the last element of the linked lis ...

Counting Leaf Nodes in a Binary Tree Calculate the number of leaf nodes within a binary tree. A leaf node is defined as a node where both the left and right child pointers are null. #include <stdio.h> #include <stdlib.h> typedef char ElemType; typedef struct BiTNode { ElemType data; struct BiTNode *lchild, *rchild; } BiTNod ...

Merge two ascending sorted linked lists into a new sorted linked list. The new list is constructed by splicing together all nodes from the two input linked lists. Example 1: Input: l1 = [1,2,4], l2 = [1,3,4] Output: [1,1,2,3,4,4] Example 2: Input: l1 = [], l2 = [0] Output: [0] class Solution: def mergeTwoLists(self, list1: ListNode, list ...

A singly linked list is built using a structure containing data and a pointer to the next node. This dynamic data strcuture supports efficient insertion, deletion, and traversal operations. Below is a concise implementation that maintains elements in ascending order during insertion: #include <stdio.h> #include <stdlib.h> typedef s ...

LeetCode 92. Reverse Linked List II Problem Statement Given the head of a singly linked list and two integers left and right where left <= right, reverse the nodes from position left to position right and return the modified list. Solution Strategy A stack provides an elegant mechanism to reverse elements in-place without complex pointer man ...

Linked List Overview A linked list represents a linear data structure where elements are stored in non-contiguous memory locations. Each element maintains a reference to the next element, creating a sequence through pointer connections rather than physical adjacency. Each node consists of two components: a data field storing the actual value an ...

Swapping Adjacent Nodes in Pairs To exchange every two consecutive nodes in a singly linked list: Introduce a dummy node to simplify edge cases. Use a pointer to traverse and perform swaps iterative. Ensure loop termination checks prevent null dereferencing. class Node: def __init__(self, value=0, nxt=None): self.value = value ...

This document covers fundamental linked list operations including element removal, list reversal, node swapping, and intersection detection. Removing Elements with Specific Value Approach Without Dummy Node This implementation handles edge cases by checking the head node separately before processing the rest of the list. struct ListNode* remov ...

Swapping Adjacent Nodes in Pairs Manipulating node connections uniformly requires a sentinel (dummy) node to eliminate edge cases for the head element. To exchange adjacent pairs, position a reference pointer immediately before the pair undergoing modification. The iterative approach tracks three critical references: the node preceding the pair ...