# Array Archive

## Sort an array of 0s, 1s and 2s

In this post, we will see how to sort an array of 0s, 1s and 2s.We have already seen a post on sort 0s and 1s in an array. Problem Given an array containing zeroes, …

## Check if it is possible to reach end of given Array by Jumping

﻿ ﻿ Problem Given an array with positive integers as elements indicating the maximum length of a jump which can be made from any position in the array. Check if it is possible to have …

## Find the local minima in array

In this post, we will see how to find the local minima in the array. Problem An element is local minima if it is less than its neighbors. Solution Naive approach You can use …

In this post, we will see how to add elements to the array. Using Apache’s common lang library You can use varargs add method to add elements to array dynamically. Here are the few add …

## Sliding Window Maximum in java

In this post, we will see about Sliding Window Maximum in java Problem Given an Array of integers and an Integer k, Find the maximum element of from all the contiguous subarrays of size K. …

## Java Array to Set

In this post, we will learn java array to set conversion. There are many ways to convert array to set. 1. Using Java 8’s Stream If you are using Java 8, I would recommend using …

## Count number of occurrences (or frequency) of each element in a sorted array

In this post, we will see how to count number of occurrences (or frequency) of each element in a sorted array Problem Given a Sorted Array of integers containing duplicates. Find the frequency of every …

## Find subarrays with given sum in an array.

In this post, we will see how to find subarrays with given sum in an array. Problem Given an Array of non negative Integers and a number. You need to print all the starting and …

## Find peak element in the array

In this post, we will see how to find peak element in the array. Problem Given an array of integers. find the peak element in the array. Peak Element is the element of the array …

## Count 1’s in sorted Binary Array

In this post, we will see how to count number of 1’s in sorted binary array. Problem Print number of 1’s in a given sorted Binary Array. For eg:- int arr = {0,0,0,1,1,1,1}; output : …