Merge Sort Implementation for Singly Linked Lists
Algorithm Overview
Split: Use slow-fast pointer technique to locate the midpoint and partition the list into two halves.
Recurse: Apply the same sorting procedure recursively on both halves.
Merge: Combine the two sorted sublists into a single sorted list using a linear-time merge step.
Implementation
class ListNode {
int value;
ListN ...
Posted on Fri, 19 Jun 2026 17:24:15 +0000 by brainstem
Counting Array Inversions Efficiently
Problem Specification
Given a sequence of n integers, compute the total number of inversions contained within the array. An inversion is formally defined as a pair of indices (i, j) satisfying i < j and A[i] > A[j].
Constraints & Limits
Sequence length: 1 ≤ n ≤ 10<sup>5</sup>
Element values: 0 ≤ A[i] ≤ 10<sup>9</ ...
Posted on Sat, 23 May 2026 18:36:57 +0000 by garydt