TheAlgorithms-C-Plus-Plus/data_structures/list_array.cpp

/**
 * @file list_array.cpp
 * @todo Add documentation
 * @warning The sorting algorithm is erroneous
 */
#include <array>
#include <iostream>

struct list {
    std::array<int, 50> data{};
    int top = 0;
    bool isSorted = false;

    int BinarySearch(const std::array<int, 50>& dataArr, int first, int last,
                     int x) {
        if (last < first) {
            return -1;
        }
        int mid = (first + last) / 2;
        if (dataArr[mid] == x) {
            return mid;
        } else if (x < dataArr[mid]) {
            return (BinarySearch(dataArr, first, mid - 1, x));
        } else if (x > dataArr[mid]) {
            return (BinarySearch(dataArr, mid + 1, last, x));
        }

        std::cerr << __func__ << ":" << __LINE__ << ": Undefined condition\n";
        return -1;
    }

    int LinearSearch(const std::array<int, 50>& dataArr, int x) const {
        for (int i = 0; i < top; i++) {
            if (dataArr[i] == x) {
                return i;
            }
        }

        return -1;
    }

    int Search(int x) {
        int pos = 0;

        if (isSorted) {
            pos = BinarySearch(data, 0, top - 1, x);
        } else {
            pos = LinearSearch(data, x);
        }

        if (pos != -1) {
            std::cout << "\nElement found at position : " << pos;
        } else {
            std::cout << "\nElement not found";
        }
        return pos;
    }

    void Sort() {
        int i = 0, j = 0, pos = 0;
        for (i = 0; i < top; i++) {
            int min = data[i];
            for (j = i + 1; j < top; j++) {
                if (data[j] < min) {
                    pos = j;
                    min = data[pos];
                }
            }

            int temp = data[i];
            data[i] = data[pos];
            data[pos] = temp;
        }
        isSorted = true;
    }

    void insert(int x) {
        if (!isSorted) {
            if (top == 49) {
                std::cout << "\nOverflow";
            } else {
                data[top] = x;
                top++;
            }
        } else {
            int pos = 0;

            for (int i = 0; i < top - 1; i++) {
                if (data[i] <= x && x <= data[i + 1]) {
                    pos = i + 1;
                    break;
                }
            }
            if (pos == 0) {
                pos = top - 1;
            }

            for (int i = top; i > pos; i--) {
                data[i] = data[i - 1];
            }
            top++;
            data[pos] = x;
        }
    }

    void Remove(int x) {
        int pos = Search(x);
        std::cout << "\n" << data[pos] << " deleted";
        for (int i = pos; i < top; i++) {
            data[i] = data[i + 1];
        }
        top--;
    }

    void Show() {
        for (int i = 0; i < top; i++) {
            std::cout << data[i] << "\t";
        }
    }
};

int main() {
    list L;
    int choice = 0;
    int x = 0;
    do {
        // Choices for operations on the list_array.
        std::cout << "\n0.Exit";
        std::cout << "\n1.Insert";
        std::cout << "\n2.Delete";
        std::cout << "\n3.Search";
        std::cout << "\n4.Sort";
        std::cout << "\n5.Print";
        std::cout << "\n\nEnter Your Choice : ";
        std::cin >> choice;
        switch (choice) {
            case 0:
                break;
            case 1:
                std::cout << "\nEnter the element to be inserted : ";
                std::cin >> x;
                L.insert(x);
                break;
            case 2:
                std::cout << "\nEnter the element to be removed : ";
                std::cin >> x;
                L.Remove(x);
                break;
            case 3:
                std::cout << "\nEnter the element to be searched : ";
                std::cin >> x;
                L.Search(x);
                break;
            case 4:
                L.Sort();
                break;
            case 5:
                L.Show();
                break;
            default:
                std::cout << "\nplease enter valid option.";
        }
    } while (choice != 0);
    return 0;
}