Heap sort & bubble sort
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Heap sort is described as sorting an array using a heap data structure. It involves building a max heap from the array, moving the largest element to the end of the array after each pass, and sifting down the new root to re-establish the heap property. Bubble sort is described as repeatedly swapping adjacent elements that are in the wrong order until the array is fully sorted. Pseudocode and a C++ program are provided to implement each algorithm.
![Program:
/*
* C++ Program to Implement Heap Sort
*/
#include <iostream>
#include <conio.h>
void max_heapify(int *a, int i, int n)
{
int j, temp;
temp = a[i];
j = 2*i;
while (j <= n)
{
if (j < n && a[j+1] > a[j])
j = j+1;
if (temp > a[j])
break;
else if (temp <= a[j])
{
a[j/2] = a[j];
j = 2*j;
}
}
a[j/2] = temp;
return;
}
void heapsort(int *a, int n)
{
int i, temp;
for (i = n; i >= 2; i--)
{
temp = a[i];
a[i] = a[1];
a[1] = temp;
max_heapify(a, 1, i - 1);
}
}
void build_maxheap(int *a, int n)
{
int i;
for(i = n/2; i >= 1; i--)
{
max_heapify(a, i, n);
}
}](https://image.slidesharecdn.com/heapsortbubblesort-170124003744/85/Heap-sort-amp-bubble-sort-2-320.jpg)
![int main()
{
int n, i, x;
cout<<"enter no of elements of arrayn";
cin>>n;
int a[20];
for (i = 1; i <= n; i++)
{
cout<<"enter element"<<(i)<<endl;
cin>>a[i];
}
build_maxheap(a,n);
heapsort(a, n);
cout<<"sorted outputn";
for (i = 1; i <= n; i++)
{
cout<<a[i]<<endl;
}
getch();
}](https://image.slidesharecdn.com/heapsortbubblesort-170124003744/85/Heap-sort-amp-bubble-sort-3-320.jpg)
![Program:
#include<iostream.h>
#include<conio.h>
void main()
{
int hold;
int array[5];
cout<<"Enter 5 numbers: "<<endl;
for(int i=0; i<5; i++)
{
cin>>array[i];
}
cout<<endl;
cout<<"Orignally entered array by the user is: "<<endl;
for(int j=0; j<5; j++)
{
cout<<array[j];
cout<<endl;
}
cout<<endl;
for(int i=0; i<4; i++)
{
for(int j=0; j<4; j++)
{
if(array[j]>array[j+1])
{
hold=array[j];
array[j]=array[j+1];
array[j+1]=hold;
}
}
}
cout<<"Sorted Array is: "<<endl;
for(int i=0; i<5; i++)
{
cout<<array[i]<<endl;
}
getch();
}
Output:](https://image.slidesharecdn.com/heapsortbubblesort-170124003744/85/Heap-sort-amp-bubble-sort-6-320.jpg)
Heap sort & bubble sort
- 1. HEAP SORT Algorithm: 1. Build a heap tree. 2. Implement heap tree using array. 3. Deleting the element from heap tree and sorting them in priority queue. 4. Print the front element and delete it for descending order. 5. Print the rear element and delete it for ascending order. 6. Stop.
- 2. Program: /* * C++ Program to Implement Heap Sort */ #include <iostream> #include <conio.h> void max_heapify(int *a, int i, int n) { int j, temp; temp = a[i]; j = 2*i; while (j <= n) { if (j < n && a[j+1] > a[j]) j = j+1; if (temp > a[j]) break; else if (temp <= a[j]) { a[j/2] = a[j]; j = 2*j; } } a[j/2] = temp; return; } void heapsort(int *a, int n) { int i, temp; for (i = n; i >= 2; i--) { temp = a[i]; a[i] = a[1]; a[1] = temp; max_heapify(a, 1, i - 1); } } void build_maxheap(int *a, int n) { int i; for(i = n/2; i >= 1; i--) { max_heapify(a, i, n); } }
- 3. int main() { int n, i, x; cout<<"enter no of elements of arrayn"; cin>>n; int a[20]; for (i = 1; i <= n; i++) { cout<<"enter element"<<(i)<<endl; cin>>a[i]; } build_maxheap(a,n); heapsort(a, n); cout<<"sorted outputn"; for (i = 1; i <= n; i++) { cout<<a[i]<<endl; } getch(); }
- 4. Output: Output enter no of elements of array 7 enter element1 34 enter element2 45 enter element3 12 enter element4 40 enter element5 6 enter element6 75 enter element7 36 sorted output 6 12 34 36 40 45 75
- 5. BUBBLE SORT ALGORITHM: 1. Read the total number of elements say n. 2. Store the elements in the array. 3. Set i=0. 4. Compare the adjacent elements. 5. Repeat step 4 for all n elements. 6. Increment the value of I by 1 and repeat step 4,5 for i<1 7. Print the stored list of elements. 8. Stop.
- 6. Program: #include<iostream.h> #include<conio.h> void main() { int hold; int array[5]; cout<<"Enter 5 numbers: "<<endl; for(int i=0; i<5; i++) { cin>>array[i]; } cout<<endl; cout<<"Orignally entered array by the user is: "<<endl; for(int j=0; j<5; j++) { cout<<array[j]; cout<<endl; } cout<<endl; for(int i=0; i<4; i++) { for(int j=0; j<4; j++) { if(array[j]>array[j+1]) { hold=array[j]; array[j]=array[j+1]; array[j+1]=hold; } } } cout<<"Sorted Array is: "<<endl; for(int i=0; i<5; i++) { cout<<array[i]<<endl; } getch(); } Output: