10 Amazon-style coding concept questions. DS basics, complexity, common patterns. MCQ format - for rapid concept check.
This Amazon drill targets data structures with a 30-minute clock, compact answer choices, and explanations that help you review the missed concept after the attempt.
First solve the questions without opening explanations. Mark doubtful items, finish the full set, then compare your score with the answer notes. That gives a clearer signal than checking every solution mid-test.
Treat the result as a topic map. If the weak area is speed, repeat the same set after one day. If the weak area is concept clarity, move to the matching PapersAdda guide and come back for a timed retest.
Attempt the timed test first. Then open each answer to compare the method, not only the option.
Answer: O(1)
Average case hash table insert is O(1). Worst case (many collisions) is O(n).
Answer: Queue
BFS uses a FIFO queue. DFS uses a LIFO stack (or recursion).
Answer: O(n²)
Worst case O(n²) when pivot is always min/max. Average O(n log n).
Answer: Root
Max-heap property: root is the largest.
Answer: Binary Search
Binary Search requires sorted input to divide the search space.
Answer: O(n)
Merge sort needs auxiliary arrays of size O(n).
Answer: Inorder
Inorder = L-Root-R, Preorder = Root-L-R, Postorder = L-R-Root.
Answer: Memoization
DP stores subproblem results (memoization or tabulation) to avoid recomputation.
Answer: QuickSort
QuickSort is not stable - equal elements may change relative order.
Answer: O(k)
You must traverse k nodes from the head; O(k), worst case O(n).
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