Yearly Archives: 2026
Find All Elements that Appear More than N/K Times
Title: Find All Elements that Appear More than N/K TimesGiven an array of size N and an integer K, we want every element that...
Find the First Repeating Element in an Array
Title: Find the First Repeating Element in an ArrayIn this guide, you will learn how to find the first repeating element in an array...
Find the First Non-Repeating Element in an Array
Title: Find the First Non-Repeating Element in an ArrayIn this guide, you'll learn how to find the first element in an integer array that...
Count Occurrences of Each Element in an Array
Title: Count Occurrences of Each Element in an ArrayCounting how many times each distinct value appears in an array is a bread-and-butter problem that...
Count Duplicate Elements in an Array
Title: Count Duplicate Elements in an ArrayCounting how many values in an array appear more than once is a classic interview warm-up that quickly...
Count Distinct Elements in an Array
Title: Count Distinct Elements in an ArrayCounting the number of distinct, or unique, values in an array is a common warm-up problem that quickly...
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...