Recall & Review
beginner
What does 'Array Deletion at Middle Index' mean?
It means removing the element located in the middle position of an array and shifting the remaining elements to fill the gap.
Click to reveal answer
beginner
How do you find the middle index of an array with an odd number of elements?
The middle index is found by dividing the length of the array by 2 and taking the floor value (integer division). For example, for 5 elements, middle index = 5 // 2 = 2.
Click to reveal answer
beginner
What happens to the elements after deleting the middle element in an array?
All elements after the deleted middle element shift one position to the left to fill the empty space, reducing the array size by one.
Click to reveal answer
intermediate
Why can't we just remove the middle element without shifting in an array?
Because arrays have fixed positions, removing an element leaves a gap. Shifting elements keeps the array continuous without empty spots.
Click to reveal answer
intermediate
What is the time complexity of deleting an element at the middle index in an array?
The time complexity is O(n) because shifting elements after the deleted index requires moving up to n/2 elements in the worst case.
Click to reveal answer
What is the middle index of an array with 7 elements?
✗ Incorrect
Middle index = 7 // 2 = 3.
After deleting the middle element, what happens to the elements on the right side?
✗ Incorrect
Elements after the deleted index shift left to fill the gap.
What is the main reason for shifting elements after deletion in an array?
✗ Incorrect
Shifting keeps the array continuous and avoids empty spaces.
What is the time complexity of deleting an element at the middle index in an array?
✗ Incorrect
Shifting elements requires O(n) time.
If an array has 6 elements, what is the middle index to delete?
✗ Incorrect
Middle index = 6 // 2 = 3.
Explain step-by-step how to delete the middle element from an array and update the array.
Think about how elements move to fill the empty space.
You got /4 concepts.
Describe why deleting an element in the middle of an array is more costly than deleting from the end.
Consider how arrays store elements in continuous memory.
You got /4 concepts.