Bucket Sort

BucketSort.txt

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+// Bucket sort in 
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#define NARRAY 7   // Array size
+#define NBUCKET 6  // Number of buckets
+#define INTERVAL 10  // Each bucket capacity
+
+struct Node {
+  int data;
+  struct Node *next;
+};
+
+void BucketSort(int arr[]);
+struct Node *InsertionSort(struct Node *list);
+void print(int arr[]);
+void printBuckets(struct Node *list);
+int getBucketIndex(int value);
+
+// Sorting function
+void BucketSort(int arr[]) {
+  int i, j;
+  struct Node **buckets;
+
+  // Create buckets and allocate memory size
+
+  buckets = (struct Node **)malloc(sizeof(struct Node *) * NBUCKET);
+
+  // Initialize empty buckets
+
+  for (i = 0; i < NBUCKET; ++i) {
+    buckets[i] = NULL;
+  }
+
+  // Fill the buckets with respective elements
+
+  for (i = 0; i < NARRAY; ++i) {
+    struct Node *current;
+    int pos = getBucketIndex(arr[i]);
+    current = (struct Node *)malloc(sizeof(struct Node));
+    current->data = arr[i];
+    current->next = buckets[pos];
+    buckets[pos] = current;
+  }
+
+  // Print the buckets along with their elements
+
+  for (i = 0; i < NBUCKET; i++) {
+    printf("Bucket[%d]: ", i);
+    printBuckets(buckets[i]);
+    printf("\n");
+  }
+
+  // Sort the elements of each bucket
+
+  for (i = 0; i < NBUCKET; ++i) {
+    buckets[i] = InsertionSort(buckets[i]);
+  }
+
+  printf("-------------\n");
+  printf("Bucktets after sorting\n");
+  for (i = 0; i < NBUCKET; i++) {
+    printf("Bucket[%d]: ", i);
+    printBuckets(buckets[i]);
+    printf("\n");
+  }
+
+  // Put sorted elements in arr
+
+  for (j = 0, i = 0; i < NBUCKET; ++i) {
+    struct Node *node;
+    node = buckets[i];
+    while (node) {
+      arr[j++] = node->data;
+      node = node->next;
+    }
+  }
+
+  return;
+}
+
+// Function to sort the elements of each bucket
+struct Node *InsertionSort(struct Node *list) {
+  struct Node *k, *nodeList;
+  if (list == 0 || list->next == 0) {
+    return list;
+  }
+
+  nodeList = list;
+  k = list->next;
+  nodeList->next = 0;
+  while (k != 0) {
+    struct Node *ptr;
+    if (nodeList->data > k->data) {
+      struct Node *tmp;
+      tmp = k;
+      k = k->next;
+      tmp->next = nodeList;
+      nodeList = tmp;
+      continue;
+    }
+
+    for (ptr = nodeList; ptr->next != 0; ptr = ptr->next) {
+      if (ptr->next->data > k->data)
+        break;
+    }
+
+    if (ptr->next != 0) {
+      struct Node *tmp;
+      tmp = k;
+      k = k->next;
+      tmp->next = ptr->next;
+      ptr->next = tmp;
+      continue;
+    } else {
+      ptr->next = k;
+      k = k->next;
+      ptr->next->next = 0;
+      continue;
+    }
+  }
+  return nodeList;
+}
+
+int getBucketIndex(int value) {
+  return value / INTERVAL;
+}
+
+void print(int ar[]) {
+  int i;
+  for (i = 0; i < NARRAY; ++i) {
+    printf("%d ", ar[i]);
+  }
+  printf("\n");
+}
+
+// Print buckets
+void printBuckets(struct Node *list) {
+  struct Node *cur = list;
+  while (cur) {
+    printf("%d ", cur->data);
+    cur = cur->next;
+  }
+}