C++ program to sort a given unsorted array of integers, in a waveform
Given: An unsorted array of integers, we have to sort the array into a wave-like array.
An array array[0….n-1] is sorted in wave form if array[0] >= array[1] <= array[2] >= array[3] <= array[4] >= array[5]…
Example:
Input: {4, 12, 15, 2, 20, 30, 21}
Output: {4 2 15 12 21 20 30}
# Algorithm
- Take an array input.
- Sort the array using sort() function.
- Elements are swapped to get the array in wave form.
Code:
#include<iostream>
#include<algorithm>
using namespace std;
void swap(int * p, int * q){
int temp = * p;
* p = * q;
* q = temp;
}
void array_in_wave(int array[], int n){
sort(array, array + n);
for (int i = 0; i < n - 1; i += 2)
swap( & array[i], & array[i + 1]);
}
int main(){
int array[100], n, i;
cout << "Enter number of elements: ";
cin >> n;
cout << "\nEnter elements: ";
for (i = 0; i < n; i++)
cin >> array[i];
cout << "Original array: ";
for (int i = 0; i < n; i++)
cout << array[i] << " ";
array_in_wave(array, n);
cout << "\nWave form of the array is: ";
for (int i = 0; i < n; i++)
cout << array[i] << " ";
return 0;
}Report Error/ Suggestion