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Update cycle_sort.cpp

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This commit is contained in:
Swastika Gupta
2021-06-30 00:13:56 +05:30
committed by GitHub
parent d54afc520f
commit 38ce79e93b
1 changed files with 29 additions and 17 deletions
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46
sorting/cycle_sort.cpp
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@@ -1,15 +1,8 @@
/**
* @file
* @brief Implementation of [Cycle
* sort](https://en.wikipedia.org/wiki/Cycle_sort) algorithm
*
* @brief Implementation of [Cycle sort](https://en.wikipedia.org/wiki/Cycle_sort) algorithm
* @details
* Cycle Sort is a sorting algorithm that works in \f$O(n^2)\f$ time in best cas
* and works in \f$O(n^2)\f$ in worst case. If a element is already at its
* correct position, do nothing. If a element is not at its correct position,
* we then need to move it to its correct position by computing the correct
* positions.Therefore, we should make sure the duplicate elements.
*
* Cycle Sort is a sorting algorithm that works in \f$O(n^2)\f$ time in best case and works in \f$O(n^2)\f$ in worst case. If a element is already at its correct position, do nothing. If a element is not at its correct position, we then need to move it to its correct position by computing the correct positions.Therefore, we should make sure the duplicate elements.
* @author [TsungHan Ho](https://github.com/dalaoqi)
*/
@@ -25,8 +18,7 @@
namespace sorting {
/**
* @namespace cycle_sort
* @brief Functions for [Cycle sort](https://en.wikipedia.org/wiki/Cycle_sort)
* algorithm
* @brief Functions for [Cycle sort](https://en.wikipedia.org/wiki/Cycle_sort) algorithm
*/
namespace cycle_sort {
/**
@@ -58,8 +50,11 @@ std::vector<T> cycleSort(const std::vector<T> &in_arr) {
// duplicate elements
while (item == arr[pos]) pos += 1;
std::swap(item, arr[pos]);
if (pos == cycle_start) {
continue;
} else {
std::swap(item, arr[pos]);
}
// Rest of the elements
while (pos != cycle_start) {
pos = cycle_start;
@@ -71,7 +66,11 @@ std::vector<T> cycleSort(const std::vector<T> &in_arr) {
}
// duplicate elements
while (item == arr[pos]) pos += 1;
std::swap(item, arr[pos]);
if (item == arr[pos]) {
continue;
} else {
std::swap(item, arr[pos]);
}
}
}
return arr;
@@ -84,9 +83,8 @@ std::vector<T> cycleSort(const std::vector<T> &in_arr) {
* @returns void
*/
static void test() {
// [506, 48, 123, 79, 0, 362, 951, 500, 0] return [0, 0, 48, 79, 123, 362,
// 500, 506, 951]
std::vector<int> array1 = {506, 48, 123, 79, 0, 362, 951, 500, 0};
// [4, 3, 2, 1] return [1, 2, 3, 4]
std::vector<int> array1 = {4, 3, 2, 1};
std::cout << "Test 1... ";
std::vector<int> arr1 = sorting::cycle_sort::cycleSort(array1);
assert(std::is_sorted(std::begin(arr1), std::end(arr1)));
@@ -98,6 +96,20 @@ static void test() {
std::vector<double> arr2 = sorting::cycle_sort::cycleSort(array2);
assert(std::is_sorted(std::begin(arr2), std::end(arr2)));
std::cout << "passed" << std::endl;
// [3, 3, 3, 3] return [3, 3, 3, 3]
std::vector<int> array3 = {3, 3, 3, 3};
std::cout << "Test 3... ";
std::vector<int> arr3 = sorting::cycle_sort::cycleSort(array3);
assert(std::is_sorted(std::begin(arr3), std::end(arr3)));
std::cout << "passed" << std::endl;
// [9, 4, 6, 8, 14, 3] return [9, 4, 6, 8, 14, 3]
std::vector<int> array4 = {3, 4, 6, 8, 9, 14};
std::cout << "Test 4... ";
std::vector<int> arr4 = sorting::cycle_sort::cycleSort(array4);
assert(std::is_sorted(std::begin(arr4), std::end(arr4)));
std::cout << "passed" << std::endl;
}
/**