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https://github.com/TheAlgorithms/C
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New sorts
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SpEXterXD
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64
sorting/bitonic_sort.c
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64
sorting/bitonic_sort.c
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#include <stdio.h>
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// Function to compare and swap elements
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void compareAndSwap(int *x, int *y, int order) {
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if ((order == 1 && *x > *y) || (order == 0 && *x < *y)) {
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int temp = *x;
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*x = *y;
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*y = temp;
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}
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}
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// Function to perform bitonic merge
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void bitonicMerge(int arr[], int low, int cnt, int order) {
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if (cnt > 1) {
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int k = cnt / 2;
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for (int i = low; i < low + k; i++) {
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compareAndSwap(&arr[i], &arr[i + k], order);
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}
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bitonicMerge(arr, low, k, order); // First half
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bitonicMerge(arr, low + k, k, order); // Second half
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}
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}
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// Function to sort a bitonic sequence
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void bitonicSort(int arr[], int low, int cnt, int order) {
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if (cnt > 1) {
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int k = cnt / 2;
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// Sort first half in ascending order
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bitonicSort(arr, low, k, 1);
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// Sort second half in descending order
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bitonicSort(arr, low + k, k, 0);
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// Merge the whole sequence in order
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bitonicMerge(arr, low, cnt, order);
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}
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}
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// Helper function to start the sorting process
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void sort(int arr[], int n, int order) {
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bitonicSort(arr, 0, n, order);
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}
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// Function to print the array
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void printArray(int arr[], int size) {
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for (int i = 0; i < size; i++)
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printf("%d ", arr[i]);
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printf("\n");
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}
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// Main function to test Bitonic Sort
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int main() {
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int arr[] = {12, 4, 7, 9, 6, 3, 8, 10};
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int n = sizeof(arr) / sizeof(arr[0]);
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printf("Original array: ");
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printArray(arr, n);
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// Sort the array in ascending order
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sort(arr, n, 1);
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printf("Sorted array: ");
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printArray(arr, n);
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return 0;
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}
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121
sorting/threeway_merge_sort.c
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121
sorting/threeway_merge_sort.c
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#include <stdio.h>
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#include <stdlib.h>
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// Function to merge three sorted subarrays
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void merge(int arr[], int left, int mid1, int mid2, int right) {
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int i, j, k;
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int n1 = mid1 - left + 1; // Size of the first subarray
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int n2 = mid2 - mid1; // Size of the second subarray
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int n3 = right - mid2; // Size of the third subarray
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// Temporary arrays
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int *L = (int*)malloc(n1 * sizeof(int));
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int *M = (int*)malloc(n2 * sizeof(int));
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int *R = (int*)malloc(n3 * sizeof(int));
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// Copy data to temporary arrays
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for (i = 0; i < n1; i++)
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L[i] = arr[left + i];
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for (j = 0; j < n2; j++)
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M[j] = arr[mid1 + 1 + j];
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for (k = 0; k < n3; k++)
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R[k] = arr[mid2 + 1 + k];
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// Merge the temporary arrays back into arr[]
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i = 0; j = 0; k = 0;
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int idx = left;
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while (i < n1 && j < n2 && k < n3) {
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if (L[i] <= M[j] && L[i] <= R[k]) {
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arr[idx++] = L[i++];
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} else if (M[j] <= L[i] && M[j] <= R[k]) {
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arr[idx++] = M[j++];
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} else {
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arr[idx++] = R[k++];
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}
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}
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// Merge remaining elements of L[]
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while (i < n1 && j < n2) {
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if (L[i] <= M[j]) {
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arr[idx++] = L[i++];
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} else {
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arr[idx++] = M[j++];
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}
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}
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while (j < n2 && k < n3) {
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if (M[j] <= R[k]) {
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arr[idx++] = M[j++];
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} else {
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arr[idx++] = R[k++];
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}
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}
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while (i < n1 && k < n3) {
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if (L[i] <= R[k]) {
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arr[idx++] = L[i++];
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} else {
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arr[idx++] = R[k++];
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}
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}
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// Copy remaining elements of L[]
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while (i < n1) {
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arr[idx++] = L[i++];
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}
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// Copy remaining elements of M[]
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while (j < n2) {
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arr[idx++] = M[j++];
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}
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// Copy remaining elements of R[]
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while (k < n3) {
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arr[idx++] = R[k++];
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}
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// Free temporary arrays
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free(L);
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free(M);
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free(R);
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}
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// Recursive function to perform 3-way MergeSort
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void mergeSort3Way(int arr[], int left, int right) {
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if (left < right) {
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int mid1 = left + (right - left) / 3;
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int mid2 = mid1 + (right - left) / 3 + 1;
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// Recursively sort three subarrays
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mergeSort3Way(arr, left, mid1);
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mergeSort3Way(arr, mid1 + 1, mid2);
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mergeSort3Way(arr, mid2 + 1, right);
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// Merge the sorted subarrays
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merge(arr, left, mid1, mid2, right);
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}
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}
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// Function to print the array
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void printArray(int arr[], int size) {
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for (int i = 0; i < size; i++)
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printf("%d ", arr[i]);
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printf("\n");
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}
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// Main function to test 3-way MergeSort
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int main() {
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int arr[] = {12, 4, 7, 9, 6, 3, 8, 10};
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int n = sizeof(arr) / sizeof(arr[0]);
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printf("Original array: ");
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printArray(arr, n);
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mergeSort3Way(arr, 0, n - 1); // Sort the array
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printf("Sorted array: ");
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printArray(arr, n);
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return 0;
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}
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118
sorting/tim_sort.c
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118
sorting/tim_sort.c
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#define RUN 32 // Size of the run
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// Function to perform insertion sort on a subarray
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void insertionSort(int arr[], int left, int right) {
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for (int i = left + 1; i <= right; i++) {
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int key = arr[i]; // Element to be inserted
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int j = i - 1;
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// Move elements of arr[left..i-1] that are greater than key
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// to one position ahead of their current position
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while (j >= left && arr[j] > key) {
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arr[j + 1] = arr[j];
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j--;
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}
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arr[j + 1] = key; // Place the key in its correct position
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}
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}
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// Function to merge two sorted subarrays
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void merge(int arr[], int left, int mid, int right) {
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int i, j, k;
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int n1 = mid - left + 1; // Size of left subarray
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int n2 = right - mid; // Size of right subarray
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// Create temporary arrays for left and right subarrays
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int *L = (int*)malloc(n1 * sizeof(int));
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int *R = (int*)malloc(n2 * sizeof(int));
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// Copy data to temporary arrays L[] and R[]
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for (i = 0; i < n1; i++)
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L[i] = arr[left + i];
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for (j = 0; j < n2; j++)
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R[j] = arr[mid + 1 + j];
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// Merge the temporary arrays back into arr[left..right]
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i = 0;
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j = 0;
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k = left;
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// Merge while both subarrays have elements
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while (i < n1 && j < n2) {
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if (L[i] <= R[j]) {
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arr[k] = L[i]; // If the current element of L[] is smaller
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i++;
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} else {
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arr[k] = R[j]; // If the current element of R[] is smaller
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j++;
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}
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k++;
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}
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// Copy remaining elements of L[], if any
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while (i < n1) {
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arr[k] = L[i];
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i++;
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k++;
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}
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// Copy remaining elements of R[], if any
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while (j < n2) {
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arr[k] = R[j];
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j++;
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k++;
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}
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// Free the temporary arrays
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free(L);
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free(R);
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}
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// Main TimSort function
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void timSort(int arr[], int n) {
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// Step 1: Sort individual subarrays of size RUN
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for (int start = 0; start < n; start += RUN) {
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int end = (start + RUN - 1 < n - 1) ? (start + RUN - 1) : (n - 1);
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insertionSort(arr, start, end); // Sort the run using insertion sort
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}
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// Step 2: Merge the sorted runs
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for (int size = RUN; size < n; size *= 2) { // Double the size of the run
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for (int left = 0; left < n; left += 2 * size) {
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int mid = left + size - 1; // Ending index of the left subarray
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int right = ((left + 2 * size - 1) < (n - 1)) ? (left + 2 * size - 1) : (n - 1); // Ending index of the right subarray
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// Merge the two subarrays if valid
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if (mid < right) {
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merge(arr, left, mid, right);
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}
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}
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}
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}
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// Function to print the array
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void printArray(int arr[], int size) {
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for (int i = 0; i < size; i++)
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printf("%d ", arr[i]); // Print each element
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printf("\n"); // New line after printing the array
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}
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// Main function to test the TimSort implementation
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int main() {
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int arr[] = {5, 21, 7, 23, 19, 10, 1, 34, 0}; // Example array
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int n = sizeof(arr) / sizeof(arr[0]); // Calculate number of elements in the array
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printf("Original array: ");
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printArray(arr, n); // Print the original array
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timSort(arr, n); // Call TimSort on the array
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printf("Sorted array: ");
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printArray(arr, n); // Print the sorted array
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return 0; // End of program
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}
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