#include <stdio.h>
#include <stdlib.h>
int main() {
    printf("INSTRUCTIONS: Enter dimensions and elements, then choose to increase/decrease rows.\n");
    int **matrix, rows, cols, i, j;
    // Initialize the 2D array
    printf("Enter the number of rows: ");
    scanf("%d", &rows);
    printf("Enter the number of columns: ");
    scanf("%d", &cols);
    matrix = (int **)malloc(rows * sizeof(int *));
    for (i = 0; i < rows; i++) {
        matrix[i] = (int *)malloc(cols * sizeof(int));
    }
    // Initialize the elements of the matrix
    printf("Enter the elements of the matrix:\n");
    for (i = 0; i < rows; i++) {
        for (j = 0; j < cols; j++) {
            scanf("%d", &matrix[i][j]);
        }
    }
    // Display the original matrix
    printf("Original Matrix:\n");
    for (i = 0; i < rows; i++) {
        for (j = 0; j < cols; j++) {
            printf("%d\t", matrix[i][j]);
        }
        printf("\n");
    }
    // Increase or decrease the number of subarrays
    int choice;
    printf("\nEnter 1 to increase the number of subarrays, 2 to decrease: ");
    scanf("%d", &choice);
    if (choice == 1) {
        // Increase the number of subarrays
        int newRows;
        printf("Enter the number of additional rows: ");
        scanf("%d", &newRows);
        matrix = (int **)realloc(matrix, (rows + newRows) * sizeof(int *));
        for (i = rows; i < rows + newRows; i++) {
            matrix[i] = (int *)malloc(cols * sizeof(int));
        }
        rows += newRows;
    } else if (choice == 2) {
        // Decrease the number of subarrays
        int removeRows;
        printf("Enter the number of rows to remove: ");
        scanf("%d", &removeRows);
        if (removeRows <= rows) {
            matrix = (int **)realloc(matrix, (rows - removeRows) * sizeof(int *));
            rows -= removeRows;
        } else {
            printf("Error: Cannot remove more rows than present.\n");
        }
    } else {
        printf("Invalid choice.\n");
    }
    // Display the modified matrix
    printf("\nModified Matrix:\n");
    for (i = 0; i < rows; i++) {
        for (j = 0; j < cols; j++) {
            printf("%d\t", matrix[i][j]);
        }
        printf("\n");
    }
    // Deallocate memory
   for (i = 0; i < rows; i++) 
        free(
            
matrix[i]);
   
    free(matrix);
    return 0;

}