Bucket_Sort.java

Sort/Java/Bucket_Sort.java

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+import java.util.Random;
+
+public class Bucket_Sort 
+{
+    static int[] sort(int[] sequence, int maxValue) 
+    {
+        // Bucket Sort
+        int[] Bucket = new int[maxValue + 1];
+        int[] sorted_sequence = new int[sequence.length];
+
+        for (int i = 0; i < sequence.length; i++)
+            Bucket[sequence[i]]++;
+
+        int outPos = 0;
+        for (int i = 0; i < Bucket.length; i++)
+            for (int j = 0; j < Bucket[i]; j++)
+                sorted_sequence[outPos++] = i;
+
+        return sorted_sequence;
+    }
+
+    static void printSequence(int[] sorted_sequence) 
+    {
+        for (int i = 0; i < sorted_sequence.length; i++)
+            System.out.print(sorted_sequence[i] + " ");
+    }
+
+    static int maxValue(int[] sequence) 
+    {
+        int maxValue = 0;
+        for (int i = 0; i < sequence.length; i++)
+            if (sequence[i] > maxValue)
+                maxValue = sequence[i];
+        return maxValue;
+    }
+
+    public static void main(String args[]) 
+    {
+        System.out.println("Sorting of randomly generated numbers using BUCKET SORT");
+        Random random = new Random();
+        int N = 20;
+        int[] sequence = new int[N];
+
+        for (int i = 0; i < N; i++)
+            sequence[i] = Math.abs(random.nextInt(100));
+
+        int maxValue = maxValue(sequence);
+
+        System.out.println("\nOriginal Sequence: ");
+        printSequence(sequence);
+
+        System.out.println("\nSorted Sequence: ");
+        printSequence(sort(sequence, maxValue));
+    }
+}

Sort/Java/HeapSort

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+
+// Java program for implementation of Heap Sort 
+public class HeapSort 
+{ 
+    public void sort(int arr[]) 
+    { 
+        int n = arr.length; 
+
+        // Build heap (rearrange array) 
+        for (int i = n / 2 - 1; i >= 0; i--) 
+            heapify(arr, n, i); 
+
+        // One by one extract an element from heap 
+        for (int i=n-1; i>=0; i--) 
+        { 
+            // Move current root to end 
+            int temp = arr[0]; 
+            arr[0] = arr[i]; 
+            arr[i] = temp; 
+
+            // call max heapify on the reduced heap 
+            heapify(arr, i, 0); 
+        } 
+    } 
+
+    // To heapify a subtree rooted with node i which is 
+    // an index in arr[]. n is size of heap 
+    void heapify(int arr[], int n, int i) 
+    { 
+        int largest = i; // Initialize largest as root 
+        int l = 2*i + 1; // left = 2*i + 1 
+        int r = 2*i + 2; // right = 2*i + 2 
+
+        // If left child is larger than root 
+        if (l < n && arr[l] > arr[largest]) 
+            largest = l; 
+
+        // If right child is larger than largest so far 
+        if (r < n && arr[r] > arr[largest]) 
+            largest = r; 
+
+        // If largest is not root 
+        if (largest != i) 
+        { 
+            int swap = arr[i]; 
+            arr[i] = arr[largest]; 
+            arr[largest] = swap; 
+
+            // Recursively heapify the affected sub-tree 
+            heapify(arr, n, largest); 
+        } 
+    } 
+
+    /* A utility function to print array of size n */
+    static void printArray(int arr[]) 
+    { 
+        int n = arr.length; 
+        for (int i=0; i<n; ++i) 
+            System.out.print(arr[i]+" "); 
+        System.out.println(); 
+    } 
+
+    // Driver program 
+    public static void main(String args[]) 
+    { 
+        int arr[] = {12, 11, 13, 5, 6, 7}; 
+        int n = arr.length; 
+
+        HeapSort ob = new HeapSort(); 
+        ob.sort(arr); 
+
+        System.out.println("Sorted array is"); 
+        printArray(arr); 
+    } 
+}