wave_sort.cpp File Reference

Implementation of the Wave sort algorithm. More...

#include <algorithm>
#include <cassert>
#include <iostream>
#include <vector>

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Namespaces
namespace	sorting
	for working with vectors
namespace	wave_sort
	Functions for the Wave sort implementation.

Functions
template<typename T >
std::vector< T >	sorting::wave_sort::waveSort (const std::vector< T > &in_arr, int64_t n)
	The main function implements that implements the Wave Sort algorithm. More...
static void	test ()
	Self-test implementations. More...
int	main ()
	Main function. More...

Detailed Description

Implementation of the Wave sort algorithm.

Wave Sort is a sorting algorithm that works in \(O(nlogn)\) time assuming the sort function used works in \(O(nlogn)\) time.

Author

Swastika Gupta

Function Documentation

main()

int main

(

void

)

Main function.

Returns

0 on exit

           {
    test();  // run self-test implementations
    return 0;
}

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test()

static void test ( )

static

Self-test implementations.

Returns

void

                   {
    // [10, 90, 49, 2, 1, 5, 23] return [2, 1, 10, 5, 49, 23, 90]
    std::vector<int64_t> array1 = {10, 90, 49, 2, 1, 5, 23};
    std::cout << "Test 1... ";
    std::vector<int64_t> arr1 = sorting::wave_sort::waveSort(array1, 7);
    const std::vector<int64_t> o1 = {2, 1, 10, 5, 49, 23, 90};
    assert(arr1 == o1);
    std::cout << "passed" << std::endl;
 
    // [1, 3, 4, 2, 7, 8] return [2, 1, 4, 3, 8, 7]
    std::vector<int64_t> array2 = {1, 3, 4, 2, 7, 8};
    std::cout << "Test 2... ";
    std::vector<int64_t> arr2 = sorting::wave_sort::waveSort(array2, 6);
    const std::vector<int64_t> o2 = {2, 1, 4, 3, 8, 7};
    assert(arr2 == o2);
    std::cout << "passed" << std::endl;
 
    // [3, 3, 3, 3] return [3, 3, 3, 3]
    std::vector<int64_t> array3 = {3, 3, 3, 3};
    std::cout << "Test 3... ";
    std::vector<int64_t> arr3 = sorting::wave_sort::waveSort(array3, 4);
    const std::vector<int64_t> o3 = {3, 3, 3, 3};
    assert(arr3 == o3);
    std::cout << "passed" << std::endl;
 
    // [9, 4, 6, 8, 14, 3] return [4, 3, 8, 6, 14, 9]
    std::vector<int64_t> array4 = {9, 4, 6, 8, 14, 3};
    std::cout << "Test 4... ";
    std::vector<int64_t> arr4 = sorting::wave_sort::waveSort(array4, 6);
    const std::vector<int64_t> o4 = {4, 3, 8, 6, 14, 9};
    assert(arr4 == o4);
    std::cout << "passed" << std::endl;
}

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waveSort()

template<typename T >

std::vector< T > sorting::wave_sort::waveSort	(	const std::vector< T > &	in_arr,
		int64_t	n
	)

The main function implements that implements the Wave Sort algorithm.

Template Parameters

T	type of array

Parameters

in_arr

array to be sorted

Returns

arr the wave sorted array

                                                             {
    std::vector<T> arr(in_arr);
 
    for (int64_t i = 0; i < n; i++) {
        arr[i] = in_arr[i];
    }
    std::sort(arr.begin(), arr.end());
    for (int64_t i = 0; i < n - 1; i += 2) {  // swap all the adjacent elements
        std::swap(arr[i], arr[i + 1]);
    }
    return arr;
}

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