DSA Assingment - 2

#include <iostream>
using namespace std;

class linearsearch {
    private:
        int a[100], n, x;
        
    public:
        int search(int arr[], int size, int key) {
            n = size;
            x = key;
            
            for (int i=0; i < n; i++) {
            a[i] = arr[i];
            }   
        
            for (int i = 0; i < size; i++) {
                if (arr[i] == key) {
                    return i;
                }
            }
            return -1;
        }
};

int main() {
    int size, x;
    
    cout << "Enter the size of the 1-d array: ";
    cin >> size;
    int arr[size];
    
    cout << "Enter all the elements separated with spaces\n";
    for(int i=0; i<size; i++){
        cin>>arr[i];
    }
    
    cout <<"Enter the element to do linear search: ";
    cin >>x;
    
    linearsearch ls;
    int index = ls.search(arr, size, x);

    if (index == -1) {
        cout << x <<" not found" << endl;
    } else {
        cout << x <<" found at index " << index <<" (starts from 0)." <<endl;
    }

    return 0;
}

#include <iostream>
#include <vector>
using namespace std;

class bubblesort{
    private:
    int a[100];
    int n;

    public:

    bubblesort(int arr[], int size){
        n = size;
        
        for (int i=0; i < n; i++) {
            a[i] = arr[i];
        }
        for (int i=0; i < n - 1; i++) {
            for (int j = 0; j < n - i - 1; j++) {
                if (a[j] > a[j+1]) {
                    int temp = a[j];
                    a[j] = a[j+1];
                    a[j+1] = temp;
                }
            }
        }
    }
    
    void display() {
        cout << "Sorted Array: ";
        for (int i = 0; i < n; i++) {
            cout << a[i] << " ";
        }
        cout << endl;
    }
};

int main() {
    int size;
    
    cout << "Enter the size of the 1-d array: ";
    cin >> size;
    
    int arr[size];
    
    cout << "Enter all the elements separated with spaces\n";
    for(int i=0; i<size; i++){
        cin>>arr[i];
    }
    
    bubblesort bs(arr, size);
    bs.display();
    
    return 0;
}

#include <iostream>
using namespace std;


class binarysearch {
    private:
        int n;
    public:
    
    void bubblesort(int arr[], int size){
        n = size;
        for (int i=0; i < n - 1; i++) {
            for (int j = 0; j < n - i - 1; j++) {
                if (arr[j] > arr[j+1]) {
                    int temp = arr[j];
                    arr[j] = arr[j+1];
                    arr[j+1] = temp;
                }
            }
        }
        
    }
    
    int search(int arr[], int x, int low, int high) {
        
      if (high >= low) {
        int mid = low + (high - low) / 2;
    
        // If found at mid, then return it
        if (arr[mid] == x)
          return mid;
    
        // Search the left half
        if (arr[mid] > x)
          return search(arr, x, low, mid - 1);
    
        // Search the right half
        return search(arr, x, mid + 1, high);
      }

  return -1;
}
};

int main() {
    int size, x;
    
    cout << "Enter the size of the 1-d array: ";
    cin >> size;
    int arr[size];
    
    cout << "Enter all the elements separated with spaces\n";
    for(int i=0; i<size; i++){
        cin>>arr[i];
    }
    
    cout <<"Enter the element to do binary search: ";
    cin >>x;

    binarysearch bs;
    bs.bubblesort(arr, size);
    
    cout<<"To do binary search, the array should be sorted\nThe sorted array is:\n";
    for(int i=0; i<size; i++){
        cout<<arr[i]<<" ";
    }
    cout<<endl;
    
    int index = bs.search(arr, x, 0, size - 1);

    if (index == -1) {
        cout << "Element not found" << endl;
    } else {
        cout << "Element "<<x<<" found at index " << index << endl;
    }

    return 0;
}

#include <iostream>
#include <vector>
using namespace std;

class selectionsort{
    private:
    int a[100];
    int n;

    public:

    selectionsort(int arr[], int size){
        n = size;
        int imin, temp;
        
        for (int i=0; i < n; i++) {
            a[i] = arr[i];
        }
       for(int i = 0; i<n-1; i++) {
          imin = i;   
          for(int j = i+1; j<n; j++)
             if(a[j] < a[imin])
                imin = j;
             temp = a[i];
             a[i] = a[imin];
             a[imin] = temp;
       }
    }
    
    void display() {
        cout << "Sorted Array: ";
        for (int i = 0; i < n; i++) {
            cout << a[i] << " ";
        }
        cout << endl;
    }
};

int main() {
    int size;
    
    cout << "Enter the size of the 1-d array: ";
    cin >> size;
    
    int arr[size];
    
    cout << "Enter all the elements separated with spaces\n";
    for(int i=0; i<size; i++){
        cin>>arr[i];
    }
    
    
    selectionsort ss(arr, size);
    ss.display();

    return 0;
}

#include <iostream>
#include <vector>
using namespace std;

class insertionsort{
    private:
    int a[100];
    int n;

    public:

    insertionsort(int arr[], int size){
        n = size;
        int j, key;
        for (int i=0; i < n; i++) {
            a[i] = arr[i];
        }
        for(int i = 1; i<size; i++) {
          key = a[i];
          j = i;
          while( j > 0 && a[j-1]>key) {
             a[j] = a[j-1];
             j--;
          }
          a[j] = key;  
       }
    }
    
    void display() {
        cout << "Sorted array: ";
        for (int i = 0; i < n; i++) {
            cout << a[i] << " ";
        }
        cout << endl;
    }
};

int main() {
    int size;
    
    cout << "Enter the size of the 1-d array: ";
    cin >> size;
    
    int arr[size];
    
    cout << "Enter all the elemets of the array with spaces:\n";
    for(int i=0; i<size; i++){
        cin>>arr[i];
    }
    
    
    insertionsort is(arr, size);
    is.display();

    return 0;
}

#include <iostream>
using namespace std;

class MergeSort {
private:
    int* arr; // pointer to dynamic array
    int size;

public:
    MergeSort(int size) { // constructor to initialize private array and size
        this->size = size;
        arr = new int[size];
    }

    void merge(int* arr, int l, int m, int r) {
        int i, j, k;
        int n1 = m - l + 1;
        int n2 = r - m;

        int L[n1], R[n2];

        for (i = 0; i < n1; i++)
            L[i] = arr[l + i];
        for (j = 0; j < n2; j++)
            R[j] = arr[m + 1 + j];

        i = 0;
        j = 0;
        k = l;
        while (i < n1 && j < n2) {
            if (L[i] <= R[j]) {
                arr[k] = L[i];
                i++;
            }
            else {
                arr[k] = R[j];
                j++;
            }
            k++;
        }

        while (i < n1) {
            arr[k] = L[i];
            i++;
            k++;
        }

        while (j < n2) {
            arr[k] = R[j];
            j++;
            k++;
        }
    }

    void mergeSort(int* arr, int l, int r) {
        if (l < r) {
            int m = l + (r - l) / 2;

            mergeSort(arr, l, m);
            mergeSort(arr, m + 1, r);

            merge(arr, l, m, r);
        }
    }

    void sort() { // public function to sort the private array
        mergeSort(arr, 0, size - 1);
    }

    void display() { // public function to display the sorted array
        cout << "Sorted array: ";
        for (int i = 0; i < size; i++) {
            cout << arr[i] << " ";
        }
        cout << endl;
    }

    ~MergeSort() { // destructor to deallocate dynamic array memory
        delete[] arr;
    }
};

int main() {
    int size;
    cout << "Enter the size of the array: ";
    cin >> size;

    int* arr = new int[size];
    cout << "Enter the elements of the array: ";
    for (int i = 0; i < size; i++) {
        cin >> arr[i];
    }

    MergeSort obj(size);
    for (int i = 0; i < size; i++) {
        obj.arr[i] = arr[i]; // copy the array to the private array in the class
    }

    obj.sort(); // sort the private array
    obj.display(); // display the sorted array

    delete[] arr; // deallocate dynamic array memory
    return 0;
}