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Bloomberg DSA Interview Questions

1190 curated coding interview questions directly asked in Bloomberg technical rounds, sorted by frequency with recency and difficulty diagnostics.

⚡ Open Interactive Tracker (1190 Problems) 🔥 Must-Solve Problem Pool 🏢 All Companies Directory

1190 Total Questions

392 (33%) Easy Problems

638 (54%) Medium Problems

160 (13%) Hard Problems

🔥 Most Tested Topics:

Arrays (432)Core DSA (418)Strings (181)Trees (131)Linked List (44)

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Showing top 200 of 1190 questions. View all 1190 in the interactive tracker.

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ID	Problem	Difficulty	Topic	Pattern	Acceptance	Frequency	Recency
2	Add Two Numbers	Medium	Core DSA	Implementation / Reasoning	48.5%	100.0%	30d
5	Longest Palindromic Substring	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS	37.8%	100.0%	30d
424	Longest Repeating Character Replacement	Medium	Strings	Hashing / Sliding Window	59.7%	87.5%	30d
380	Insert Delete GetRandom O(1)	Medium	Core DSA	Implementation / Reasoning	55.4%	75.0%	30d
1	Two Sum	Easy	Arrays	Sorting / Prefix / Scan; Two Pointers	57.5%	75.0%	30d
253	Meeting Rooms II	Medium	Greedy	Greedy	52.7%	75.0%	30d
796	Rotate String	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	66.6%	75.0%	30d
1752	Check if Array Is Sorted and Rotated	Easy	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	57.2%	75.0%	30d
49	Group Anagrams	Medium	Strings	Hashing / Sliding Window	72.6%	75.0%	30d
3	Longest Substring Without Repeating Characters	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS; Sliding Window	39.1%	75.0%	30d
22	Generate Parentheses	Medium	Strings	Hashing / Sliding Window	78.7%	75.0%	3m
42	Trapping Rain Water	Hard	Core DSA	Two Pointers	67.4%	75.0%	3m
121	Best Time to Buy and Sell Stock	Easy	Core DSA	Implementation / Reasoning	56.8%	75.0%	3m
20	Valid Parentheses	Easy	Strings	Hashing / Sliding Window	44.2%	75.0%	3m
79	Word Search	Medium	Strings; Binary Search	Hashing / Sliding Window; Binary Search	47.4%	75.0%	3m
21	Merge Two Sorted Lists	Easy	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	68.3%	75.0%	3m
70	Climbing Stairs	Easy	Dynamic Programming	State Transition	54.1%	75.0%	3m
15	3Sum	Medium	Arrays	Sorting / Prefix / Scan	39.1%	75.0%	3m
128	Longest Consecutive Sequence	Medium	Core DSA	Implementation / Reasoning	47.1%	75.0%	3m
56	Merge Intervals	Medium	Arrays	Sorting / Prefix / Scan	51.8%	62.5%	30d
200	Number of Islands	Medium	Graphs	BFS / DFS / Topological Sort	64.4%	62.5%	30d
394	Decode String	Medium	Strings; Dynamic Programming; Stack / Queue	Hashing / Sliding Window; State Transition; Monotonic Stack / Simulation	62.6%	62.5%	30d
2833	Furthest Point From Origin	Easy	Core DSA	Implementation / Reasoning	77.0%	62.5%	30d
139	Word Break	Medium	Strings; Dynamic Programming	Hashing / Sliding Window; State Transition	49.5%	62.5%	30d
430	Flatten a Multilevel Doubly Linked List	Medium	Linked List	Two Pointers	62.9%	62.5%	30d
48	Rotate Image	Medium	Arrays	Sorting / Prefix / Scan	80.1%	62.5%	30d
30	Substring with Concatenation of All Words	Hard	Strings; Trees	Hashing / Sliding Window; DFS / BFS	34.4%	62.5%	30d
75	Sort Colors	Medium	Arrays	Sorting / Prefix / Scan	69.6%	62.5%	30d
933	Number of Recent Calls	Easy	Core DSA	Implementation / Reasoning	78.5%	62.5%	30d
125	Valid Palindrome	Easy	Strings	Hashing / Sliding Window	53.3%	62.5%	30d
14	Longest Common Prefix	Easy	Core DSA	Implementation / Reasoning	47.6%	62.5%	30d
33	Search in Rotated Sorted Array	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	44.9%	62.5%	30d
4	Median of Two Sorted Arrays	Hard	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	46.6%	62.5%	3m
26	Remove Duplicates from Sorted Array	Easy	Arrays	Sorting / Prefix / Scan; Two Pointers	62.8%	62.5%	3m
560	Subarray Sum Equals K	Medium	Arrays	Sorting / Prefix / Scan	47.3%	62.5%	3m
1396	Design Underground System	Medium	Design	Data Structure Design	74.5%	62.5%	3m
146	LRU Cache	Medium	Design	Data Structure Design	47.4%	62.5%	3m
1169	Invalid Transactions	Medium	Strings	Hashing / Sliding Window	32.3%	62.5%	3m
242	Valid Anagram	Easy	Strings	Hashing / Sliding Window	68.1%	62.5%	3m
283	Move Zeroes	Easy	Core DSA	Two Pointers	63.8%	62.5%	3m
322	Coin Change	Medium	Dynamic Programming	State Transition	48.4%	62.5%	3m
50	Pow(x, n)	Medium	Core DSA	Implementation / Reasoning	38.7%	62.5%	3m
88	Merge Sorted Array	Easy	Arrays	Sorting / Prefix / Scan	54.9%	62.5%	3m
1274	Number of Ships in a Rectangle	Hard	Binary Search	Binary Search	68.9%	62.5%	3m
69	Sqrt(x)	Easy	Binary Search	Binary Search	41.8%	62.5%	3m
18	4Sum	Medium	Arrays	Sorting / Prefix / Scan	40.6%	62.5%	3m
27	Remove Element	Easy	Core DSA	Implementation / Reasoning	61.8%	62.5%	3m
875	Koko Eating Bananas	Medium	Binary Search	Binary Search	50.0%	62.5%	3m
387	First Unique Character in a String	Easy	Strings	Hashing / Sliding Window	65.5%	62.5%	3m
2667	Create Hello World Function	Easy	Core DSA	Implementation / Reasoning	81.9%	62.5%	3m
138	Copy List with Random Pointer	Medium	Linked List	Two Pointers	62.9%	62.5%	3m
344	Reverse String	Easy	Strings	Hashing / Sliding Window	80.8%	62.5%	3m
35	Search Insert Position	Easy	Binary Search	Binary Search	51.3%	62.5%	3m
236	Lowest Common Ancestor of a Binary Tree	Medium	Trees	DFS / BFS	69.3%	62.5%	3m
1249	Minimum Remove to Make Valid Parentheses	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	71.5%	62.5%	6m
152	Maximum Product Subarray	Medium	Arrays	Sorting / Prefix / Scan	36.4%	62.5%	6m
1209	Remove All Adjacent Duplicates in String II	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	61.3%	62.5%	6m
2423	Remove Letter To Equalize Frequency	Easy	Strings	Hashing / Sliding Window	19.4%	62.5%	6m
445	Add Two Numbers II	Medium	Core DSA	Implementation / Reasoning	62.6%	62.5%	6m
131	Palindrome Partitioning	Medium	Strings; Dynamic Programming	Hashing / Sliding Window; State Transition	74.1%	62.5%	all
9	Palindrome Number	Easy	Strings	Hashing / Sliding Window	60.6%	50.0%	3m
13	Roman to Integer	Easy	Strings	Hashing / Sliding Window	66.6%	50.0%	3m
140	Word Break II	Hard	Strings; Dynamic Programming	Hashing / Sliding Window; State Transition	55.6%	50.0%	3m
399	Evaluate Division	Medium	Core DSA	Implementation / Reasoning	64.2%	50.0%	3m
155	Min Stack	Medium	Stack / Queue	Monotonic Stack / Simulation	58.2%	50.0%	3m
1387	Sort Integers by The Power Value	Medium	Arrays	Sorting / Prefix / Scan	71.7%	50.0%	3m
797	All Paths From Source to Target	Medium	Core DSA	Implementation / Reasoning	83.6%	50.0%	3m
496	Next Greater Element I	Easy	Stack / Queue	Monotonic Stack / Simulation	76.1%	50.0%	3m
1244	Design A Leaderboard	Medium	Design	Data Structure Design	68.1%	50.0%	3m
994	Rotting Oranges	Medium	Core DSA	Implementation / Reasoning	58.7%	50.0%	3m
1656	Design an Ordered Stream	Easy	Design	Data Structure Design	82.7%	50.0%	3m
127	Word Ladder	Hard	Strings	Hashing / Sliding Window	45.6%	50.0%	3m
17	Letter Combinations of a Phone Number	Medium	Strings; Backtracking	Hashing / Sliding Window; Backtracking	66.1%	50.0%	3m
347	Top K Frequent Elements	Medium	Heap	Priority Queue	66.4%	50.0%	3m
1583	Count Unhappy Friends	Medium	Core DSA	Implementation / Reasoning	62.5%	50.0%	3m
217	Contains Duplicate	Easy	Arrays	Sorting / Prefix / Scan	64.4%	50.0%	3m
167	Two Sum II - Input Array Is Sorted	Medium	Arrays	Sorting / Prefix / Scan; Two Pointers	65.1%	50.0%	3m
234	Palindrome Linked List	Easy	Strings; Linked List	Hashing / Sliding Window; Two Pointers	58.0%	50.0%	3m
1029	Two City Scheduling	Medium	Core DSA	Implementation / Reasoning	68.5%	50.0%	3m
101	Symmetric Tree	Easy	Trees	DFS / BFS	61.2%	50.0%	3m
73	Set Matrix Zeroes	Medium	Arrays	Sorting / Prefix / Scan	62.9%	50.0%	3m
134	Gas Station	Medium	Greedy	Greedy	48.0%	50.0%	3m
543	Diameter of Binary Tree	Easy	Trees	DFS / BFS	65.5%	50.0%	3m
189	Rotate Array	Medium	Arrays	Sorting / Prefix / Scan	44.9%	50.0%	3m
45	Jump Game II	Medium	Greedy	Greedy	42.9%	50.0%	3m
130	Surrounded Regions	Medium	Core DSA	Implementation / Reasoning	45.3%	50.0%	3m
3488	Closest Equal Element Queries	Medium	Core DSA	Implementation / Reasoning	51.4%	50.0%	3m
118	Pascal's Triangle	Easy	Core DSA	Implementation / Reasoning	78.9%	50.0%	3m
198	House Robber	Medium	Dynamic Programming	State Transition	53.2%	50.0%	3m
904	Fruit Into Baskets	Medium	Core DSA	Implementation / Reasoning	51.1%	50.0%	3m
31	Next Permutation	Medium	Backtracking	Backtracking	45.3%	50.0%	3m
23	Merge k Sorted Lists	Hard	Arrays; Linked List; Heap	Sorting / Prefix / Scan; Two Pointers; Priority Queue	59.6%	50.0%	6m
143	Reorder List	Medium	Linked List	Two Pointers	65.3%	50.0%	6m
540	Single Element in a Sorted Array	Medium	Arrays	Sorting / Prefix / Scan	59.3%	50.0%	6m
987	Vertical Order Traversal of a Binary Tree	Hard	Trees	DFS / BFS	53.8%	50.0%	6m
485	Max Consecutive Ones	Easy	Core DSA	Implementation / Reasoning	65.2%	50.0%	6m
219	Contains Duplicate II	Easy	Arrays	Sorting / Prefix / Scan	51.3%	50.0%	6m
148	Sort List	Medium	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	64.4%	50.0%	6m
239	Sliding Window Maximum	Hard	Arrays	Sorting / Prefix / Scan; Sliding Window	48.8%	50.0%	6m
98	Validate Binary Search Tree	Medium	Strings; Trees; Binary Search	Hashing / Sliding Window; DFS / BFS; Binary Search	35.8%	50.0%	6m
643	Maximum Average Subarray I	Easy	Arrays	Sorting / Prefix / Scan	47.8%	50.0%	6m
227	Basic Calculator II	Medium	Stack / Queue	Monotonic Stack / Simulation	46.9%	50.0%	6m
105	Construct Binary Tree from Preorder and Inorder Traversal	Medium	Trees	DFS / BFS	68.8%	50.0%	6m
1148	Article Views I	Easy	Core DSA	Implementation / Reasoning	76.6%	50.0%	6m
36	Valid Sudoku	Medium	Strings; Backtracking	Hashing / Sliding Window; Backtracking	64.5%	50.0%	6m
32	Longest Valid Parentheses	Hard	Strings	Hashing / Sliding Window	38.8%	50.0%	6m
19	Remove Nth Node From End of List	Medium	Trees; Linked List	DFS / BFS; Two Pointers	51.6%	50.0%	all
24	Swap Nodes in Pairs	Medium	Trees	DFS / BFS	69.5%	50.0%	all
103	Binary Tree Zigzag Level Order Traversal	Medium	Trees	DFS / BFS	63.7%	50.0%	all
104	Maximum Depth of Binary Tree	Easy	Arrays; Trees	Sorting / Prefix / Scan; DFS / BFS	78.2%	50.0%	all
117	Populating Next Right Pointers in Each Node II	Medium	Trees	DFS / BFS	57.6%	50.0%	all
122	Best Time to Buy and Sell Stock II	Medium	Core DSA	Implementation / Reasoning	71.1%	50.0%	all
160	Intersection of Two Linked Lists	Easy	Linked List	Two Pointers	63.7%	50.0%	all
172	Factorial Trailing Zeroes	Medium	Core DSA	Implementation / Reasoning	46.7%	50.0%	all
179	Largest Number	Medium	Core DSA	Implementation / Reasoning	43.1%	50.0%	all
207	Course Schedule	Medium	Graphs	BFS / DFS / Topological Sort	51.4%	50.0%	all
229	Majority Element II	Medium	Core DSA	Implementation / Reasoning	56.2%	50.0%	all
235	Lowest Common Ancestor of a Binary Search Tree	Medium	Trees; Binary Search	DFS / BFS; Binary Search	70.6%	50.0%	all
274	H-Index	Medium	Core DSA	Implementation / Reasoning	41.4%	50.0%	all
297	Serialize and Deserialize Binary Tree	Hard	Trees; Design	DFS / BFS; Data Structure Design	60.8%	50.0%	all
328	Odd Even Linked List	Medium	Linked List	Two Pointers	62.5%	50.0%	all
386	Lexicographical Numbers	Medium	Graphs	BFS / DFS / Topological Sort	76.2%	50.0%	all
443	String Compression	Medium	Strings	Hashing / Sliding Window	60.0%	50.0%	all
901	Online Stock Span	Medium	Core DSA	Implementation / Reasoning	69.1%	50.0%	all
912	Sort an Array	Medium	Arrays	Sorting / Prefix / Scan	55.9%	50.0%	all
1482	Minimum Number of Days to Make m Bouquets	Medium	Arrays	Sorting / Prefix / Scan	56.6%	50.0%	all
1661	Average Time of Process per Machine	Easy	Core DSA	Implementation / Reasoning	66.8%	50.0%	all
1768	Merge Strings Alternately	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	82.1%	50.0%	all
7	Reverse Integer	Medium	Core DSA	Implementation / Reasoning	31.9%	37.5%	3m
8	String to Integer (atoi)	Medium	Strings	Hashing / Sliding Window	21.0%	37.5%	3m
238	Product of Array Except Self	Medium	Arrays	Sorting / Prefix / Scan	68.9%	37.5%	3m
66	Plus One	Easy	Core DSA	Implementation / Reasoning	50.0%	37.5%	3m
54	Spiral Matrix	Medium	Arrays	Sorting / Prefix / Scan	56.8%	37.5%	3m
11	Container With Most Water	Medium	Core DSA	Two Pointers	60.0%	37.5%	3m
704	Binary Search	Easy	Binary Search	Binary Search	60.9%	37.5%	3m
67	Add Binary	Easy	Core DSA	Implementation / Reasoning	58.1%	37.5%	3m
739	Daily Temperatures	Medium	Stack / Queue	Monotonic Stack / Simulation	68.7%	37.5%	3m
74	Search a 2D Matrix	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	53.9%	37.5%	3m
61	Rotate List	Medium	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	42.6%	37.5%	3m
136	Single Number	Easy	Core DSA	Implementation / Reasoning	77.7%	37.5%	3m
175	Combine Two Tables	Easy	Core DSA	Implementation / Reasoning	79.5%	37.5%	3m
55	Jump Game	Medium	Greedy	Greedy	40.9%	37.5%	3m
100	Same Tree	Easy	Trees	DFS / BFS	67.1%	37.5%	3m
169	Majority Element	Easy	Core DSA	Implementation / Reasoning	66.3%	37.5%	3m
611	Valid Triangle Number	Medium	Strings	Hashing / Sliding Window	56.9%	37.5%	3m
547	Number of Provinces	Medium	Core DSA	Implementation / Reasoning	70.4%	37.5%	3m
435	Non-overlapping Intervals	Medium	Arrays; Greedy	Sorting / Prefix / Scan; Greedy	57.1%	37.5%	3m
1480	Running Sum of 1d Array	Easy	Arrays	Sorting / Prefix / Scan	86.9%	37.5%	3m
142	Linked List Cycle II	Medium	Linked List	Two Pointers	57.9%	37.5%	3m
3848	Check Digitorial Permutation	Medium	Backtracking	Backtracking	46.7%	37.5%	3m
503	Next Greater Element II	Medium	Stack / Queue	Monotonic Stack / Simulation	68.4%	37.5%	3m
525	Contiguous Array	Medium	Arrays	Sorting / Prefix / Scan	51.3%	37.5%	3m
450	Delete Node in a BST	Medium	Trees	DFS / BFS	54.7%	37.5%	3m
77	Combinations	Medium	Backtracking	Backtracking	74.6%	37.5%	3m
326	Power of Three	Easy	Core DSA	Implementation / Reasoning	51.1%	37.5%	3m
509	Fibonacci Number	Easy	Core DSA	Implementation / Reasoning	74.1%	37.5%	3m
1727	Largest Submatrix With Rearrangements	Medium	Arrays	Sorting / Prefix / Scan	80.2%	37.5%	3m
111	Minimum Depth of Binary Tree	Easy	Arrays; Trees	Sorting / Prefix / Scan; DFS / BFS	52.9%	37.5%	3m
225	Implement Stack using Queues	Easy	Stack / Queue	Monotonic Stack / Simulation	69.9%	37.5%	3m
6	Zigzag Conversion	Medium	Core DSA	Implementation / Reasoning	54.2%	37.5%	3m
206	Reverse Linked List	Easy	Linked List	Two Pointers	80.6%	37.5%	3m
153	Find Minimum in Rotated Sorted Array	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	54.7%	37.5%	3m
977	Squares of a Sorted Array	Easy	Arrays	Sorting / Prefix / Scan	73.8%	37.5%	3m
215	Kth Largest Element in an Array	Medium	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	68.9%	37.5%	3m
678	Valid Parenthesis String	Medium	Strings	Hashing / Sliding Window	40.1%	37.5%	3m
210	Course Schedule II	Medium	Graphs	BFS / DFS / Topological Sort	55.5%	37.5%	3m
59	Spiral Matrix II	Medium	Arrays	Sorting / Prefix / Scan	75.1%	37.5%	3m
228	Summary Ranges	Easy	Arrays	Sorting / Prefix / Scan	54.2%	37.5%	3m
368	Largest Divisible Subset	Medium	Core DSA	Implementation / Reasoning	49.6%	37.5%	3m
584	Find Customer Referee	Easy	Core DSA	Implementation / Reasoning	72.9%	37.5%	3m
53	Maximum Subarray	Medium	Arrays	Sorting / Prefix / Scan	53.3%	37.5%	3m
1848	Minimum Distance to the Target Element	Easy	Arrays	Sorting / Prefix / Scan	64.5%	37.5%	3m
2035	Partition Array Into Two Arrays to Minimize Sum Difference	Hard	Arrays; Dynamic Programming	Sorting / Prefix / Scan; State Transition	23.4%	37.5%	3m
438	Find All Anagrams in a String	Medium	Strings	Hashing / Sliding Window	53.8%	37.5%	3m
332	Reconstruct Itinerary	Hard	Core DSA	Implementation / Reasoning	44.6%	37.5%	3m
181	Employees Earning More Than Their Managers	Easy	Core DSA	Implementation / Reasoning	73.2%	37.5%	3m
78	Subsets	Medium	Backtracking	Backtracking	82.3%	37.5%	3m
176	Second Highest Salary	Medium	Core DSA	Implementation / Reasoning	47.0%	37.5%	3m
1929	Concatenation of Array	Easy	Arrays	Sorting / Prefix / Scan	90.3%	37.5%	3m
349	Intersection of Two Arrays	Easy	Arrays	Sorting / Prefix / Scan	77.8%	37.5%	3m
150	Evaluate Reverse Polish Notation	Medium	Core DSA	Implementation / Reasoning	57.8%	37.5%	3m
40	Combination Sum II	Medium	Arrays; Backtracking	Sorting / Prefix / Scan; Backtracking	59.5%	37.5%	3m
1321	Restaurant Growth	Medium	Core DSA	Implementation / Reasoning	58.8%	37.5%	3m
135	Candy	Hard	Core DSA	Implementation / Reasoning	48.5%	37.5%	3m
209	Minimum Size Subarray Sum	Medium	Arrays	Sorting / Prefix / Scan	51.7%	37.5%	3m
412	Fizz Buzz	Easy	Core DSA	Implementation / Reasoning	75.5%	37.5%	3m
34	Find First and Last Position of Element in Sorted Array	Medium	Arrays	Sorting / Prefix / Scan	48.9%	37.5%	3m
1722	Minimize Hamming Distance After Swap Operations	Medium	Core DSA	Implementation / Reasoning	69.7%	37.5%	3m
28	Find the Index of the First Occurrence in a String	Easy	Strings	Hashing / Sliding Window	46.7%	37.5%	3m
1235	Maximum Profit in Job Scheduling	Hard	Arrays	Sorting / Prefix / Scan	54.7%	37.5%	3m
268	Missing Number	Easy	Arrays	Sorting / Prefix / Scan	72.0%	37.5%	3m
197	Rising Temperature	Easy	Core DSA	Implementation / Reasoning	51.3%	37.5%	3m
162	Find Peak Element	Medium	Binary Search	Binary Search	47.0%	37.5%	3m
595	Big Countries	Easy	Trees	DFS / BFS	68.5%	37.5%	3m
224	Basic Calculator	Hard	Stack / Queue	Monotonic Stack / Simulation	46.9%	37.5%	3m
37	Sudoku Solver	Hard	Backtracking	Backtracking	65.5%	37.5%	3m
941	Valid Mountain Array	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	35.3%	37.5%	3m
2657	Find the Prefix Common Array of Two Arrays	Medium	Arrays	Sorting / Prefix / Scan	88.3%	37.5%	3m
1757	Recyclable and Low Fat Products	Easy	Arrays	Sorting / Prefix / Scan	88.6%	37.5%	3m
300	Longest Increasing Subsequence	Medium	Dynamic Programming	State Transition	59.4%	37.5%	3m

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