Array Deletion at Middle Index in DSA C - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to shift elements left after deleting an element at index mid.

DSA C

for (int i = mid; i < n - 1; i++) {
    arr[i] = arr[1];
}

Drag options to blanks, or click blank then click option'

A[i + 1]

B[i - 1]

C[mid]

D[i]

Attempts:

3 left

💡 Hint

Common Mistakes

Using arr[i - 1] which shifts elements incorrectly.

Using arr[mid] which copies the same element repeatedly.

After deleting the element at index mid, each element from mid+1 to end shifts left by one, so arr[i] = arr[i + 1].

2fill in blank

medium

Complete the code to reduce the array size after deletion.

DSA C

n = n [1] 1;

Drag options to blanks, or click blank then click option'

A+

B-

C*

D/

Attempts:

3 left

💡 Hint

Common Mistakes

Using addition which increases the size incorrectly.

Using multiplication or division which changes size wrongly.

After deleting one element, the size of the array decreases by 1, so n = n - 1.

3fill in blank

hard

Fix the error in the loop condition to avoid accessing out of bounds.

DSA C

for (int i = mid; i [1] n - 1; i++) {
    arr[i] = arr[i + 1];
}

Drag options to blanks, or click blank then click option'

A<=

B>=

C>

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes out of bounds access.

Using > or >= causes the loop to skip or run incorrectly.

The loop should run while i is less than n - 1 to avoid accessing arr[n], so condition is i < n - 1.

4fill in blank

hard

Fill both blanks to print the array elements after deletion.

DSA C

for (int i = 0; i [1] n; i++) {
    printf("%d ", arr[2]);
}

Drag options to blanks, or click blank then click option'

A<

B<=

C[i]

D[n]

Attempts:

3 left

💡 Hint

Common Mistakes

Using <= causes printing one extra element.

Using arr[n] causes out of bounds access.

Loop runs from i = 0 to i < n, and prints arr[i] elements.

5fill in blank

hard

Fill all three blanks to delete the middle element and print the updated array.

DSA C

int mid = n [1] 2;
for (int i = mid; i < n [2] 1; i++) {
    arr[i] = arr[i [3] 1];
}
n = n - 1;
for (int i = 0; i < n; i++) {
    printf("%d ", arr[i]);
}

Drag options to blanks, or click blank then click option'

A/

B+

C-

D*

Attempts:

3 left

💡 Hint

Common Mistakes

Using subtraction instead of addition in arr[i] assignment.

Using multiplication or wrong loop condition.

mid is n / 2; loop runs while i < n - 1; arr[i] = arr[i + 1] to shift elements left.