What is a waveform array?

What is a waveform array?

You are given an unsorted array of integers( arr ) of length n , write a program to sort it in wave form. Problem Note: If there are multiple sorted orders in wave form, return the one which is lexicographically smallest. The array may contain duplicates.

How do you sort an array in wave form?

A Simple Solution is to use sorting. First sort the input array, then swap all adjacent elements. For example, let the input array be {3, 6, 5, 10, 7, 20}. After sorting, we get {3, 5, 6, 7, 10, 20}.

How can I rearrange a given array so that Arr I becomes Arr Arr i ]] with O 1 extra space?

Rearrange the given array so that arr[i] becomes arr[arr[i]]. This should be done with O(1) extra space….Algorithm:

1. Traverse the array from start to end.
2. For every index increment the element by array[array[index] ] % n.
3. Again Travsese the array from start to end.

How do you sort an array explain?

A sorted array is an array data structure in which each element is sorted in numerical, alphabetical, or some other order, and placed at equally spaced addresses in computer memory. It is typically used in computer science to implement static lookup tables to hold multiple values which have the same data type.

How do you declare a one dimensional array?

Rules for Declaring One Dimensional Array

1. An array variable must be declared before being used in a program.
2. The declaration must have a data type(int, float, char, double, etc.), variable name, and subscript.
3. The subscript represents the size of the array.
4. An array index always starts from 0.

How do you return the first value in an array?

reset() rewinds array’s internal pointer to the first element and returns the value of the first array element, or FALSE if the array is empty. Although it is passed by reference to reset, the original array is not modified.

What is an array explain with an example?

An array is a data structure that contains a group of elements. Typically these elements are all of the same data type, such as an integer or string. For example, a search engine may use an array to store Web pages found in a search performed by the user.

How do you count the frequency of a number in an array Java?

Program:

1. public class Frequency {
2. public static void main(String[] args) {
3. //Initialize array.
4. int [] arr = new int [] {1, 2, 8, 3, 2, 2, 2, 5, 1};
5. //Array fr will store frequencies of element.
6. int [] fr = new int [arr. length];
7. int visited = -1;
8. for(int i = 0; i < arr. length; i++){

How to check if an array is wave array?

The task is to check if the array is sorted in wave form. Recommended: Please try your approach on {IDE} first, before moving on to the solution. First check the element at index 1, i.e, A [1] and observe the pattern. If arr [1] is greater than its left and right element, then this pattern will be followed by other elements.

How to create an array in wave form?

The array elements in the resultant array must be such that arr [0] >= arr [1] <= arr [2] >= arr [3] <= arr [4] ….. If there are multiple sorted orders in wave form, return the one which is lexicographically smallest. The array may contain duplicates.

How to sort an array in O ( n ) time?

This can be done in O (n) time by doing a single traversal of given array. The idea is based on the fact that if we make sure that all even positioned (at index 0, 2, 4, ..) elements are greater than their adjacent odd elements, we don’t need to worry about odd positioned element.