Recall & Review
beginner
What happens when you delete the first element of an array?
The first element is removed, and all other elements shift one position to the left to fill the gap.
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beginner
Why does deleting the first element of an array take more time than deleting the last element?
Because after removing the first element, all other elements must move one step left, which takes extra time.
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beginner
Show the array after deleting the first element from [10, 20, 30, 40].
After deletion, the array becomes [20, 30, 40]. The element 10 is removed and others shift left.
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intermediate
What is the time complexity of deleting the first element in a simple array?
O(n), where n is the number of elements, because all elements after the first must be shifted.
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intermediate
Can you delete the first element of an array without shifting elements?
No, in a simple array you must shift elements to keep order. Some data structures like linked lists avoid this.
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What is the first step when deleting the first element of an array?
✗ Incorrect
Deleting the first element means removing it and shifting all other elements one position left.
What is the time complexity of deleting the first element in an array of size n?
✗ Incorrect
All elements after the first must be shifted left, so it takes O(n) time.
After deleting the first element from [5, 10, 15], what is the new array?
✗ Incorrect
The first element 5 is removed, so the array becomes [10, 15].
Which data structure can delete the first element without shifting all elements?
✗ Incorrect
Linked lists can remove the first element by changing pointers without shifting.
What happens to the array size after deleting the first element?
✗ Incorrect
Deleting an element reduces the array size by one.
Explain step-by-step what happens when you delete the first element of an array.
Think about how the array elements move after deletion.
You got /3 concepts.
Why is deleting the first element in an array less efficient than deleting the last element?
Consider what happens to the elements after the deleted position.
You got /3 concepts.