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Oracle DSA Interview Questions

323 curated coding interview questions directly asked in Oracle technical rounds, sorted by frequency with recency and difficulty diagnostics.

⚡ Open Interactive Tracker (323 Problems) 🔥 Must-Solve Problem Pool 🏢 All Companies Directory

323 Total Questions

62 (19%) Easy Problems

199 (62%) Medium Problems

62 (19%) Hard Problems

🔥 Most Tested Topics:

Arrays (101)Core DSA (78)Strings (62)Trees (44)Linked List (24)

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Showing top 200 of 323 questions. View all 323 in the interactive tracker.

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ID	Problem	Difficulty	Topic	Pattern	Acceptance	Frequency	Recency
146	LRU Cache	Medium	Design	Data Structure Design	47.4%	100.0%	3m
129	Sum Root to Leaf Numbers	Medium	Arrays	Sorting / Prefix / Scan	70.0%	87.5%	3m
498	Diagonal Traverse	Medium	Core DSA	Implementation / Reasoning	67.2%	87.5%	3m
200	Number of Islands	Medium	Graphs	BFS / DFS / Topological Sort	64.4%	87.5%	3m
199	Binary Tree Right Side View	Medium	Trees	DFS / BFS	70.2%	87.5%	3m
1	Two Sum	Easy	Arrays	Sorting / Prefix / Scan; Two Pointers	57.5%	75.0%	6m
20	Valid Parentheses	Easy	Strings	Hashing / Sliding Window	44.2%	75.0%	6m
460	LFU Cache	Hard	Design	Data Structure Design	49.2%	75.0%	6m
735	Asteroid Collision	Medium	Core DSA	Implementation / Reasoning	47.9%	75.0%	6m
56	Merge Intervals	Medium	Arrays	Sorting / Prefix / Scan	51.8%	75.0%	all
239	Sliding Window Maximum	Hard	Arrays	Sorting / Prefix / Scan; Sliding Window	48.8%	75.0%	all
3	Longest Substring Without Repeating Characters	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS; Sliding Window	39.1%	62.5%	6m
23	Merge k Sorted Lists	Hard	Arrays; Linked List; Heap	Sorting / Prefix / Scan; Two Pointers; Priority Queue	59.6%	62.5%	6m
49	Group Anagrams	Medium	Strings	Hashing / Sliding Window	72.6%	62.5%	6m
253	Meeting Rooms II	Medium	Greedy	Greedy	52.7%	62.5%	6m
347	Top K Frequent Elements	Medium	Heap	Priority Queue	66.4%	62.5%	6m
11	Container With Most Water	Medium	Core DSA	Two Pointers	60.0%	62.5%	6m
875	Koko Eating Bananas	Medium	Binary Search	Binary Search	50.0%	62.5%	6m
127	Word Ladder	Hard	Strings	Hashing / Sliding Window	45.6%	62.5%	6m
543	Diameter of Binary Tree	Easy	Trees	DFS / BFS	65.5%	62.5%	6m
42	Trapping Rain Water	Hard	Core DSA	Two Pointers	67.4%	62.5%	6m
102	Binary Tree Level Order Traversal	Medium	Trees	DFS / BFS	72.7%	62.5%	6m
155	Min Stack	Medium	Stack / Queue	Monotonic Stack / Simulation	58.2%	62.5%	6m
845	Longest Mountain in Array	Medium	Arrays	Sorting / Prefix / Scan	42.1%	62.5%	6m
34	Find First and Last Position of Element in Sorted Array	Medium	Arrays	Sorting / Prefix / Scan	48.9%	62.5%	6m
695	Max Area of Island	Medium	Graphs	BFS / DFS / Topological Sort	74.0%	62.5%	6m
1169	Invalid Transactions	Medium	Strings	Hashing / Sliding Window	32.3%	62.5%	6m
366	Find Leaves of Binary Tree	Medium	Trees	DFS / BFS	81.3%	62.5%	6m
981	Time Based Key-Value Store	Medium	Core DSA	Implementation / Reasoning	49.9%	62.5%	6m
1669	Merge In Between Linked Lists	Medium	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	83.0%	62.5%	6m
76	Minimum Window Substring	Hard	Arrays; Strings; Trees	Sorting / Prefix / Scan; Hashing / Sliding Window; DFS / BFS; Sliding Window	47.5%	62.5%	6m
322	Coin Change	Medium	Dynamic Programming	State Transition	48.4%	62.5%	6m
752	Open the Lock	Medium	Core DSA	Implementation / Reasoning	61.3%	62.5%	6m
13	Roman to Integer	Easy	Strings	Hashing / Sliding Window	66.6%	62.5%	all
15	3Sum	Medium	Arrays	Sorting / Prefix / Scan	39.1%	62.5%	all
22	Generate Parentheses	Medium	Strings	Hashing / Sliding Window	78.7%	62.5%	all
54	Spiral Matrix	Medium	Arrays	Sorting / Prefix / Scan	56.8%	62.5%	all
128	Longest Consecutive Sequence	Medium	Core DSA	Implementation / Reasoning	47.1%	62.5%	all
206	Reverse Linked List	Easy	Linked List	Two Pointers	80.6%	62.5%	all
236	Lowest Common Ancestor of a Binary Tree	Medium	Trees	DFS / BFS	69.3%	62.5%	all
242	Valid Anagram	Easy	Strings	Hashing / Sliding Window	68.1%	62.5%	all
295	Find Median from Data Stream	Hard	Heap	Priority Queue	54.5%	62.5%	all
394	Decode String	Medium	Strings; Dynamic Programming; Stack / Queue	Hashing / Sliding Window; State Transition; Monotonic Stack / Simulation	62.6%	62.5%	all
450	Delete Node in a BST	Medium	Trees	DFS / BFS	54.7%	62.5%	all
2466	Count Ways To Build Good Strings	Medium	Strings	Hashing / Sliding Window	58.9%	62.5%	all
2506	Count Pairs Of Similar Strings	Easy	Strings	Hashing / Sliding Window	73.7%	62.5%	all
2580	Count Ways to Group Overlapping Ranges	Medium	Core DSA	Implementation / Reasoning	39.1%	62.5%	all
2549	Count Distinct Numbers on Board	Easy	Core DSA	Implementation / Reasoning	61.8%	62.5%	all
2836	Maximize Value of Function in a Ball Passing Game	Hard	Core DSA	Implementation / Reasoning	31.0%	62.5%	all
994	Rotting Oranges	Medium	Core DSA	Implementation / Reasoning	58.7%	62.5%	all
3012	Minimize Length of Array Using Operations	Medium	Arrays	Sorting / Prefix / Scan	35.8%	62.5%	all
3015	Count the Number of Houses at a Certain Distance I	Medium	Core DSA	Implementation / Reasoning	57.7%	62.5%	all
3017	Count the Number of Houses at a Certain Distance II	Hard	Core DSA	Implementation / Reasoning	23.7%	62.5%	all
2192	All Ancestors of a Node in a Directed Acyclic Graph	Medium	Trees; Graphs	DFS / BFS; BFS / DFS / Topological Sort	62.2%	62.5%	all
1380	Lucky Numbers in a Matrix	Easy	Arrays	Sorting / Prefix / Scan	80.0%	62.5%	all
1410	HTML Entity Parser	Medium	Core DSA	Implementation / Reasoning	50.1%	62.5%	all
1611	Minimum One Bit Operations to Make Integers Zero	Hard	Arrays	Sorting / Prefix / Scan	78.4%	62.5%	all
1797	Design Authentication Manager	Medium	Design	Data Structure Design	58.6%	62.5%	all
1200	Minimum Absolute Difference	Easy	Arrays	Sorting / Prefix / Scan	75.1%	62.5%	all
3438	Find Valid Pair of Adjacent Digits in String	Easy	Strings	Hashing / Sliding Window	60.9%	62.5%	all
1209	Remove All Adjacent Duplicates in String II	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	61.3%	50.0%	6m
33	Search in Rotated Sorted Array	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	44.9%	50.0%	6m
1235	Maximum Profit in Job Scheduling	Hard	Arrays	Sorting / Prefix / Scan	54.7%	50.0%	6m
5	Longest Palindromic Substring	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS	37.8%	50.0%	6m
207	Course Schedule	Medium	Graphs	BFS / DFS / Topological Sort	51.4%	50.0%	6m
1539	Kth Missing Positive Number	Easy	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	63.5%	50.0%	6m
767	Reorganize String	Medium	Strings	Hashing / Sliding Window	57.1%	50.0%	6m
1944	Number of Visible People in a Queue	Hard	Stack / Queue	Monotonic Stack / Simulation	73.1%	50.0%	6m
4	Median of Two Sorted Arrays	Hard	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	46.6%	50.0%	6m
445	Add Two Numbers II	Medium	Core DSA	Implementation / Reasoning	62.6%	50.0%	6m
378	Kth Smallest Element in a Sorted Matrix	Medium	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	64.6%	50.0%	6m
107	Binary Tree Level Order Traversal II	Medium	Trees	DFS / BFS	68.2%	50.0%	6m
987	Vertical Order Traversal of a Binary Tree	Hard	Trees	DFS / BFS	53.8%	50.0%	6m
53	Maximum Subarray	Medium	Arrays	Sorting / Prefix / Scan	53.3%	50.0%	6m
121	Best Time to Buy and Sell Stock	Easy	Core DSA	Implementation / Reasoning	56.8%	50.0%	6m
2204	Distance to a Cycle in Undirected Graph	Hard	Graphs; Linked List	BFS / DFS / Topological Sort; Two Pointers	73.6%	50.0%	6m
1290	Convert Binary Number in a Linked List to Integer	Easy	Linked List	Two Pointers	82.4%	50.0%	6m
3650	Minimum Cost Path with Edge Reversals	Medium	Arrays	Sorting / Prefix / Scan	61.8%	50.0%	6m
1488	Avoid Flood in The City	Medium	Core DSA	Implementation / Reasoning	39.0%	50.0%	6m
359	Logger Rate Limiter	Easy	Design	Data Structure Design	76.8%	50.0%	6m
6	Zigzag Conversion	Medium	Core DSA	Implementation / Reasoning	54.2%	50.0%	6m
12	Integer to Roman	Medium	Strings	Hashing / Sliding Window	71.0%	50.0%	all
14	Longest Common Prefix	Easy	Core DSA	Implementation / Reasoning	47.6%	50.0%	all
17	Letter Combinations of a Phone Number	Medium	Strings; Backtracking	Hashing / Sliding Window; Backtracking	66.1%	50.0%	all
41	First Missing Positive	Hard	Arrays	Sorting / Prefix / Scan	42.9%	50.0%	all
75	Sort Colors	Medium	Arrays	Sorting / Prefix / Scan	69.6%	50.0%	all
93	Restore IP Addresses	Medium	Core DSA	Implementation / Reasoning	56.0%	50.0%	all
98	Validate Binary Search Tree	Medium	Strings; Trees; Binary Search	Hashing / Sliding Window; DFS / BFS; Binary Search	35.8%	50.0%	all
103	Binary Tree Zigzag Level Order Traversal	Medium	Trees	DFS / BFS	63.7%	50.0%	all
124	Binary Tree Maximum Path Sum	Hard	Arrays; Trees	Sorting / Prefix / Scan; DFS / BFS	42.3%	50.0%	all
134	Gas Station	Medium	Greedy	Greedy	48.0%	50.0%	all
138	Copy List with Random Pointer	Medium	Linked List	Two Pointers	62.9%	50.0%	all
140	Word Break II	Hard	Strings; Dynamic Programming	Hashing / Sliding Window; State Transition	55.6%	50.0%	all
169	Majority Element	Easy	Core DSA	Implementation / Reasoning	66.3%	50.0%	all
179	Largest Number	Medium	Core DSA	Implementation / Reasoning	43.1%	50.0%	all
210	Course Schedule II	Medium	Graphs	BFS / DFS / Topological Sort	55.5%	50.0%	all
215	Kth Largest Element in an Array	Medium	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	68.9%	50.0%	all
221	Maximal Square	Medium	Core DSA	Implementation / Reasoning	50.3%	50.0%	all
230	Kth Smallest Element in a BST	Medium	Trees; Heap	DFS / BFS; Priority Queue	76.8%	50.0%	all
240	Search a 2D Matrix II	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	57.3%	50.0%	all
238	Product of Array Except Self	Medium	Arrays	Sorting / Prefix / Scan	68.9%	50.0%	all
252	Meeting Rooms	Easy	Greedy	Greedy	59.4%	50.0%	all
283	Move Zeroes	Easy	Core DSA	Two Pointers	63.8%	50.0%	all
300	Longest Increasing Subsequence	Medium	Dynamic Programming	State Transition	59.4%	50.0%	all
345	Reverse Vowels of a String	Easy	Strings	Hashing / Sliding Window	61.3%	50.0%	all
74	Search a 2D Matrix	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	53.9%	50.0%	all
380	Insert Delete GetRandom O(1)	Medium	Core DSA	Implementation / Reasoning	55.4%	50.0%	all
443	String Compression	Medium	Strings	Hashing / Sliding Window	60.0%	50.0%	all
525	Contiguous Array	Medium	Arrays	Sorting / Prefix / Scan	51.3%	50.0%	all
560	Subarray Sum Equals K	Medium	Arrays	Sorting / Prefix / Scan	47.3%	50.0%	all
588	Design In-Memory File System	Hard	Design	Data Structure Design	48.4%	50.0%	all
621	Task Scheduler	Medium	Greedy	Greedy	63.1%	50.0%	all
697	Degree of an Array	Easy	Arrays	Sorting / Prefix / Scan	58.4%	50.0%	all
1353	Maximum Number of Events That Can Be Attended	Medium	Arrays	Sorting / Prefix / Scan	39.0%	50.0%	all
96	Unique Binary Search Trees	Medium	Trees; Binary Search	DFS / BFS; Binary Search	63.7%	50.0%	all
2291	Maximum Profit From Trading Stocks	Medium	Arrays	Sorting / Prefix / Scan	48.2%	50.0%	all
125	Valid Palindrome	Easy	Strings	Hashing / Sliding Window	53.3%	50.0%	all
71	Simplify Path	Medium	Core DSA	Implementation / Reasoning	50.6%	50.0%	all
647	Palindromic Substrings	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS	72.8%	50.0%	all
51	N-Queens	Hard	Backtracking	Backtracking	75.5%	50.0%	all
208	Implement Trie (Prefix Tree)	Medium	Trees	DFS / BFS	69.5%	50.0%	all
755	Pour Water	Medium	Core DSA	Implementation / Reasoning	49.1%	50.0%	all
2954	Count the Number of Infection Sequences	Hard	Core DSA	Implementation / Reasoning	37.8%	50.0%	all
3799	Word Squares II	Medium	Strings	Hashing / Sliding Window	55.1%	50.0%	all
2	Add Two Numbers	Medium	Core DSA	Implementation / Reasoning	48.5%	37.5%	all
10	Regular Expression Matching	Hard	Core DSA	Implementation / Reasoning	31.0%	37.5%	all
21	Merge Two Sorted Lists	Easy	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	68.3%	37.5%	all
26	Remove Duplicates from Sorted Array	Easy	Arrays	Sorting / Prefix / Scan; Two Pointers	62.8%	37.5%	all
40	Combination Sum II	Medium	Arrays; Backtracking	Sorting / Prefix / Scan; Backtracking	59.5%	37.5%	all
45	Jump Game II	Medium	Greedy	Greedy	42.9%	37.5%	all
46	Permutations	Medium	Backtracking	Backtracking	81.9%	37.5%	all
50	Pow(x, n)	Medium	Core DSA	Implementation / Reasoning	38.7%	37.5%	all
48	Rotate Image	Medium	Arrays	Sorting / Prefix / Scan	80.1%	37.5%	all
55	Jump Game	Medium	Greedy	Greedy	40.9%	37.5%	all
61	Rotate List	Medium	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	42.6%	37.5%	all
73	Set Matrix Zeroes	Medium	Arrays	Sorting / Prefix / Scan	62.9%	37.5%	all
79	Word Search	Medium	Strings; Binary Search	Hashing / Sliding Window; Binary Search	47.4%	37.5%	all
83	Remove Duplicates from Sorted List	Easy	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	56.7%	37.5%	all
88	Merge Sorted Array	Easy	Arrays	Sorting / Prefix / Scan	54.9%	37.5%	all
113	Path Sum II	Medium	Arrays; Trees	Sorting / Prefix / Scan; DFS / BFS	62.2%	37.5%	all
116	Populating Next Right Pointers in Each Node	Medium	Trees	DFS / BFS	67.2%	37.5%	all
141	Linked List Cycle	Easy	Linked List	Two Pointers	54.3%	37.5%	all
148	Sort List	Medium	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	64.4%	37.5%	all
162	Find Peak Element	Medium	Binary Search	Binary Search	47.0%	37.5%	all
205	Isomorphic Strings	Easy	Strings	Hashing / Sliding Window	48.4%	37.5%	all
209	Minimum Size Subarray Sum	Medium	Arrays	Sorting / Prefix / Scan	51.7%	37.5%	all
224	Basic Calculator	Hard	Stack / Queue	Monotonic Stack / Simulation	46.9%	37.5%	all
9	Palindrome Number	Easy	Strings	Hashing / Sliding Window	60.6%	37.5%	all
237	Delete Node in a Linked List	Medium	Trees; Linked List	DFS / BFS; Two Pointers	83.9%	37.5%	all
273	Integer to English Words	Hard	Strings	Hashing / Sliding Window	35.0%	37.5%	all
69	Sqrt(x)	Easy	Binary Search	Binary Search	41.8%	37.5%	all
387	First Unique Character in a String	Easy	Strings	Hashing / Sliding Window	65.5%	37.5%	all
415	Add Strings	Easy	Strings	Hashing / Sliding Window	52.2%	37.5%	all
463	Island Perimeter	Easy	Graphs	BFS / DFS / Topological Sort	74.4%	37.5%	all
468	Validate IP Address	Medium	Strings	Hashing / Sliding Window	28.3%	37.5%	all
2472	Maximum Number of Non-overlapping Palindrome Substrings	Hard	Arrays; Strings; Trees; Greedy	Sorting / Prefix / Scan; Hashing / Sliding Window; DFS / BFS; Greedy	44.7%	37.5%	all
540	Single Element in a Sorted Array	Medium	Arrays	Sorting / Prefix / Scan	59.3%	37.5%	all
2561	Rearranging Fruits	Hard	Core DSA	Implementation / Reasoning	57.3%	37.5%	all
692	Top K Frequent Words	Medium	Strings; Heap	Hashing / Sliding Window; Priority Queue	60.2%	37.5%	all
694	Number of Distinct Islands	Medium	Graphs	BFS / DFS / Topological Sort	62.8%	37.5%	all
696	Count Binary Substrings	Easy	Strings; Trees	Hashing / Sliding Window; DFS / BFS	70.4%	37.5%	all
139	Word Break	Medium	Strings; Dynamic Programming	Hashing / Sliding Window; State Transition	49.5%	37.5%	all
739	Daily Temperatures	Medium	Stack / Queue	Monotonic Stack / Simulation	68.7%	37.5%	all
706	Design HashMap	Easy	Design	Data Structure Design	66.6%	37.5%	all
1010	Pairs of Songs With Total Durations Divisible by 60	Medium	Core DSA	Implementation / Reasoning	53.5%	37.5%	all
1011	Capacity To Ship Packages Within D Days	Medium	Binary Search	Binary Search	73.9%	37.5%	all
1047	Remove All Adjacent Duplicates In String	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	73.2%	37.5%	all
1268	Search Suggestions System	Medium	Binary Search	Binary Search	65.2%	37.5%	all
1636	Sort Array by Increasing Frequency	Easy	Arrays	Sorting / Prefix / Scan	80.8%	37.5%	all
115	Distinct Subsequences	Hard	Core DSA	Implementation / Reasoning	51.9%	37.5%	all
435	Non-overlapping Intervals	Medium	Arrays; Greedy	Sorting / Prefix / Scan; Greedy	57.1%	37.5%	all
2151	Maximum Good People Based on Statements	Hard	Arrays	Sorting / Prefix / Scan	52.4%	37.5%	all
912	Sort an Array	Medium	Arrays	Sorting / Prefix / Scan	55.9%	37.5%	all
114	Flatten Binary Tree to Linked List	Medium	Trees; Linked List	DFS / BFS; Two Pointers	70.7%	37.5%	all
217	Contains Duplicate	Easy	Arrays	Sorting / Prefix / Scan	64.4%	37.5%	all
582	Kill Process	Medium	Core DSA	Implementation / Reasoning	70.7%	37.5%	all
151	Reverse Words in a String	Medium	Strings	Hashing / Sliding Window	56.4%	37.5%	all
1823	Find the Winner of the Circular Game	Medium	Core DSA	Implementation / Reasoning	82.2%	37.5%	all
1507	Reformat Date	Easy	Core DSA	Implementation / Reasoning	68.5%	37.5%	all
496	Next Greater Element I	Easy	Stack / Queue	Monotonic Stack / Simulation	76.1%	37.5%	all
198	House Robber	Medium	Dynamic Programming	State Transition	53.2%	37.5%	all
567	Permutation in String	Medium	Strings; Backtracking	Hashing / Sliding Window; Sliding Window; Backtracking	48.9%	37.5%	all
2062	Count Vowel Substrings of a String	Easy	Strings; Trees	Hashing / Sliding Window; DFS / BFS	73.2%	37.5%	all
153	Find Minimum in Rotated Sorted Array	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	54.7%	37.5%	all
227	Basic Calculator II	Medium	Stack / Queue	Monotonic Stack / Simulation	46.9%	37.5%	all
31	Next Permutation	Medium	Backtracking	Backtracking	45.3%	37.5%	all
1283	Find the Smallest Divisor Given a Threshold	Medium	Core DSA	Implementation / Reasoning	65.9%	37.5%	all
340	Longest Substring with At Most K Distinct Characters	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS; Sliding Window	50.0%	37.5%	all
2303	Calculate Amount Paid in Taxes	Easy	Core DSA	Implementation / Reasoning	69.3%	37.5%	all
863	All Nodes Distance K in Binary Tree	Medium	Trees	DFS / BFS	67.7%	37.5%	all
120	Triangle	Medium	Core DSA	Implementation / Reasoning	59.9%	37.5%	all
1249	Minimum Remove to Make Valid Parentheses	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	71.5%	37.5%	all
713	Subarray Product Less Than K	Medium	Arrays	Sorting / Prefix / Scan	54.3%	37.5%	all
2448	Minimum Cost to Make Array Equal	Hard	Arrays	Sorting / Prefix / Scan	46.8%	37.5%	all
133	Clone Graph	Medium	Graphs	BFS / DFS / Topological Sort	65.3%	37.5%	all
7	Reverse Integer	Medium	Core DSA	Implementation / Reasoning	31.9%	37.5%	all
2008	Maximum Earnings From Taxi	Medium	Arrays	Sorting / Prefix / Scan	46.5%	37.5%	all
841	Keys and Rooms	Medium	Core DSA	Implementation / Reasoning	75.8%	37.5%	all
29	Divide Two Integers	Medium	Core DSA	Implementation / Reasoning	19.8%	37.5%	all
176	Second Highest Salary	Medium	Core DSA	Implementation / Reasoning	47.0%	37.5%	all

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