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In-Place Algorithm

Last Updated: 29 August 2022

In-place has more than one definition. One strict definition is.An in-place algorithm is an algorithm that does not need an extra space and produces an output in the same ...read more

array-rearrange

Minimum swaps required to bring all elements less than or equal to k together

Last Updated: 24 March 2023

Given an array of n positive integers and a number k. Find the minimum number of swaps required to bring all the numbers less than or equal to k together.Example:Input: ar...read more

array-rearrange

Rearrange array such that arr[i] >= arr[j] if i is even and arr[i]<=arr[j] if i is odd and j < i

Last Updated: 14 November 2022

Given an array of n elements. Our task is to write a program to rearrange the array such that elements at even positions are greater than all elements before it and elemen ...read more

array-rearrange

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20.6k+ articles

7.6k+ articles

6.4k+ articles

2k+ articles

1.7k+ articles

1.6k+ articles

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1.2k+ articles

650+ articles

400+ articles

Rearrange an array such that arr[i] = i

Last Updated: 11 April 2023

Given an array of elements of length N, ranging from 0 to N - 1. All elements may not be present in the array. If the element is not present then there will be -1 present ...read more

array-rearrange

Even numbers at even index and odd numbers at odd index

Last Updated: 31 March 2023

Given an array of size n containing equal number of odd and even numbers. The problem is to arrange the numbers in such a way that all the even numbers get the even index ...read more

array-rearrange

Move all negative numbers to beginning and positive to end with constant extra space

Last Updated: 19 September 2023

An array contains both positive and negative numbers in random order. Rearrange the array elements so that all negative numbers appear before all positive numbers.Examples ...read more

array-rearrange

Rearrange an array in order - smallest, largest, 2nd smallest, 2nd largest, ..

Last Updated: 21 August 2022

Given an array of integers, the task is to print the array in the order - smallest number, the Largest number, 2nd smallest number, 2nd largest number, 3rd smallest number...read more

array-rearrange

Alternative Sorting

Last Updated: 21 August 2022

Given an array of integers, print the array in such a way that the first element is first maximum and second element is first minimum and so on.Examples :Input : arr[] = { ...read more

array-rearrange

Rearrange an array in maximum minimum form | Set 2 (O(1) extra space)

Last Updated: 31 July 2023

Given a sorted array of positive integers, rearrange the array alternately i.e first element should be the maximum value, second minimum value, third-second max, fourth-se ...read more

Modular Arithmetic

array-rearrange

Three way partitioning of an array around a given range

Last Updated: 20 February 2023

Given an array and a range [lowVal, highVal], partition the array around the range such that array is divided in three parts.All elements smaller than lowVal come first.Al...read more

array-rearrange

Move all negative elements to end in order with extra space allowed

Last Updated: 22 September 2023

Given an unsorted array arr[] of both negative and positive integer. The task is place all negative element at the end of array without changing the order of positive elem ...read more

array-rearrange

Rearrange positive and negative numbers with constant extra space

Last Updated: 24 March 2023

Given an array of positive and negative numbers, arrange them such that all negative integers appear before all the positive integers in the array without using any additi ...read more

array-rearrange

Sort an array in wave form

Last Updated: 05 January 2023

Given an unsorted array of integers, sort the array into a wave array. An array arr[0..n-1] is sorted in wave form if:arr[0] = arr[1] = arr[2] = arr[3] = arr[4] = .....Exa ...read more

array-rearrange

Rearrange array in alternating positive & negative items with O(1) extra space | Set 1

Last Updated: 06 September 2023

Given an array having positive and negative numbers, our task is to arrange them in an alternate fashion such that every positive number is followed by a negative number a ...read more

array-rearrange

Rearrange positive and negative numbers in O(n) time and O(1) extra space

Last Updated: 17 August 2023

An array contains both positive and negative numbers in random order. Rearrange the array elements so that positive and negative numbers are placed alternatively. A number ...read more

array-rearrange

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