#include <stdio.h>
#include <stdlib.h>
 
int main() {
    int *arr;
    int n, newSize, i;
 
    // Step 1: Allocate initial memory using malloc()
    printf("Enter initial number of elements: ");
    scanf("%d", &n);
 
    arr = (int*) malloc(n * sizeof(int));
    if (arr == NULL) {
        printf("Memory allocation failed!\n");
        return 1;
    }
 
    // Step 2: Input elements
    printf("\nEnter %d elements:\n", n);
    for (i = 0; i < n; i++) {
        printf("Element %d: ", i + 1);
        scanf("%d", &arr[i]);
    }
 
    // Display original array
    printf("\nOriginal array elements:\n");
    for (i = 0; i < n; i++) {
        printf("%d ", arr[i]);
    }
 
    // Step 3: Reallocate memory
    printf("\n\nEnter new size of array: ");
    scanf("%d", &newSize);
 
    arr = (int*) realloc(arr, newSize * sizeof(int));
    if (arr == NULL) {
        printf("Memory reallocation failed!\n");
        return 1;
    }
 
    // Step 4: If array size increased, take new inputs
    if (newSize > n) {
        printf("\nEnter %d new elements:\n", newSize - n);
        for (i = n; i < newSize; i++) {
            printf("Element %d: ", i + 1);
            scanf("%d", &arr[i]);
        }
    }
 
    // Step 5: Display updated array
    printf("\nUpdated array elements:\n");
    for (i = 0; i < newSize; i++) {
        printf("%d ", arr[i]);
    }
 
    // Step 6: Free memory
    free(arr);
    printf("\n\nMemory has been freed successfully.\n");
 
    return 0;
}