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bucket.cpp
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bucket.cpp
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#include <iomanip>
#include <iostream>
using namespace std;
#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++) {
cout << "Bucket[" << i << "] : ";
printBuckets(buckets[i]);
cout << endl;
}
// Sort the elements of each bucket
for (i = 0; i < NBUCKET; ++i) {
buckets[i] = InsertionSort(buckets[i]);
}
cout << "-------------" << endl;
cout << "Bucktets after sorted" << endl;
for (i = 0; i < NBUCKET; i++) {
cout << "Bucket[" << i << "] : ";
printBuckets(buckets[i]);
cout << endl;
}
// Put sorted elements on arr
for (j = 0, i = 0; i < NBUCKET; ++i) {
struct Node *node;
node = buckets[i];
while (node) {
arr[j++] = node->data;
node = node->next;
}
}
for (i = 0; i < NBUCKET; ++i) {
struct Node *node;
node = buckets[i];
while (node) {
struct Node *tmp;
tmp = node;
node = node->next;
free(tmp);
}
}
free(buckets);
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;
}
// Print buckets
void print(int ar[]) {
int i;
for (i = 0; i < NARRAY; ++i) {
cout << setw(3) << ar[i];
}
cout << endl;
}
void printBuckets(struct Node *list) {
struct Node *cur = list;
while (cur) {
cout << setw(3) << cur->data;
cur = cur->next;
}
}
// Driver code
int main(void) {
int array[NARRAY] = {42, 32, 33, 52, 37, 47, 51};
cout << "Initial array: " << endl;
print(array);
cout << "-------------" << endl;
BucketSort(array);
cout << "-------------" << endl;
cout << "Sorted array: " << endl;
print(array);
}