Monthly Archives: October, 2026
Three-Way Partition of an Array
Title: Three-Way Partition of an ArrayIn this guide, you will learn how to perform a three-way partition of an array around a pivot value...
Dutch National Flag Problem in Java
Title: Dutch National Flag Problem in JavaThe Dutch National Flag problem is a classic sorting challenge introduced by Edsger Dijkstra. Given an array that...
Partition an Array Around a Pivot
Title: Partition an Array Around a PivotPartitioning an array around a pivot value is a core technique behind QuickSort and many selection problems. In...
Separate Zeros, Ones, and Twos in an Array
Title: Separate Zeros, Ones, and Twos in an ArrayIn this guide, you will learn how to rearrange an integer array that contains only the...
Move All Odd Numbers to the End of an Array
Title: Move All Odd Numbers to the End of an ArrayIn this guide, you will learn how to rearrange an integer array so that...
Move Negative Numbers to the Left of an Array
Title: Move Negative Numbers to the Left of an ArrayIn this guide, you'll learn how to rearrange an integer array so that every negative...
Move All Zeros to the Beginning of an Array
Title: Move All Zeros to the Beginning of an ArrayRearranging an array in place is a classic interview question because it tests whether you...
Move All Zeros to the End of an Array
Title: Move All Zeros to the End of an ArrayMoving all the zeros in an array to the end, while keeping the other elements...
Rearrange Array so that arr[i] Becomes arr[arr[i]]
Title: Rearrange Array so that arr Becomes arr]If you are given an array where every value is itself a valid index into that same...
Rearrange Array in Zigzag Order
Title: Rearrange Array in Zigzag OrderIn this guide, we will explore how to rearrange an array in Java so its elements alternate between smaller...