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Zoho DSA Interview Questions

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

⚡ Open Interactive Tracker (173 Problems) 🔥 Must-Solve Problem Pool 🏢 All Companies Directory

173 Total Questions

59 (34%) Easy Problems

95 (55%) Medium Problems

19 (11%) Hard Problems

🔥 Most Tested Topics:

Arrays (59)Core DSA (53)Strings (44)Dynamic Programming (11)Backtracking (8)

📂 Sourced Datasets:

Last 3 monthsLast 6 monthsAll questionsOlder than 6 months

Showing 173 of 173 displayed

ID	Problem	Difficulty	Topic	Pattern	Acceptance	Frequency	Recency
394	Decode String	Medium	Strings; Dynamic Programming; Stack / Queue	Hashing / Sliding Window; State Transition; Monotonic Stack / Simulation	62.6%	100.0%	3m
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	Medium	Arrays; Dynamic Programming	Sorting / Prefix / Scan; State Transition	90.5%	100.0%	3m
3	Longest Substring Without Repeating Characters	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS; Sliding Window	39.1%	100.0%	6m
54	Spiral Matrix	Medium	Arrays	Sorting / Prefix / Scan	56.8%	100.0%	all
56	Merge Intervals	Medium	Arrays	Sorting / Prefix / Scan	51.8%	87.5%	6m
739	Daily Temperatures	Medium	Stack / Queue	Monotonic Stack / Simulation	68.7%	87.5%	6m
70	Climbing Stairs	Easy	Dynamic Programming	State Transition	54.1%	87.5%	6m
1	Two Sum	Easy	Arrays	Sorting / Prefix / Scan; Two Pointers	57.5%	87.5%	all
5	Longest Palindromic Substring	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS	37.8%	87.5%	all
20	Valid Parentheses	Easy	Strings	Hashing / Sliding Window	44.2%	87.5%	all
121	Best Time to Buy and Sell Stock	Easy	Core DSA	Implementation / Reasoning	56.8%	87.5%	all
11	Container With Most Water	Medium	Core DSA	Two Pointers	60.0%	75.0%	6m
435	Non-overlapping Intervals	Medium	Arrays; Greedy	Sorting / Prefix / Scan; Greedy	57.1%	75.0%	6m
40	Combination Sum II	Medium	Arrays; Backtracking	Sorting / Prefix / Scan; Backtracking	59.5%	75.0%	6m
79	Word Search	Medium	Strings; Binary Search	Hashing / Sliding Window; Binary Search	47.4%	75.0%	6m
961	N-Repeated Element in Size 2N Array	Easy	Arrays	Sorting / Prefix / Scan	79.9%	75.0%	6m
560	Subarray Sum Equals K	Medium	Arrays	Sorting / Prefix / Scan	47.3%	75.0%	6m
115	Distinct Subsequences	Hard	Core DSA	Implementation / Reasoning	51.9%	75.0%	6m
273	Integer to English Words	Hard	Strings	Hashing / Sliding Window	35.0%	75.0%	6m
32	Longest Valid Parentheses	Hard	Strings	Hashing / Sliding Window	38.8%	75.0%	6m
6	Zigzag Conversion	Medium	Core DSA	Implementation / Reasoning	54.2%	75.0%	all
14	Longest Common Prefix	Easy	Core DSA	Implementation / Reasoning	47.6%	75.0%	all
10	Regular Expression Matching	Hard	Core DSA	Implementation / Reasoning	31.0%	75.0%	all
22	Generate Parentheses	Medium	Strings	Hashing / Sliding Window	78.7%	75.0%	all
42	Trapping Rain Water	Hard	Core DSA	Two Pointers	67.4%	75.0%	all
44	Wildcard Matching	Hard	Core DSA	Implementation / Reasoning	32.0%	75.0%	all
48	Rotate Image	Medium	Arrays	Sorting / Prefix / Scan	80.1%	75.0%	all
49	Group Anagrams	Medium	Strings	Hashing / Sliding Window	72.6%	75.0%	all
165	Compare Version Numbers	Medium	Core DSA	Implementation / Reasoning	46.4%	75.0%	all
200	Number of Islands	Medium	Graphs	BFS / DFS / Topological Sort	64.4%	75.0%	all
2164	Sort Even and Odd Indices Independently	Easy	Arrays	Sorting / Prefix / Scan	63.4%	75.0%	all
1275	Find Winner on a Tic Tac Toe Game	Easy	Core DSA	Implementation / Reasoning	54.6%	75.0%	all
1910	Remove All Occurrences of a Substring	Medium	Strings; Trees	Hashing / Sliding Window; DFS / BFS	78.5%	75.0%	all
179	Largest Number	Medium	Core DSA	Implementation / Reasoning	43.1%	75.0%	all
69	Sqrt(x)	Easy	Binary Search	Binary Search	41.8%	75.0%	all
3827	Count Monobit Integers	Easy	Core DSA	Implementation / Reasoning	66.4%	75.0%	all
13	Roman to Integer	Easy	Strings	Hashing / Sliding Window	66.6%	62.5%	all
33	Search in Rotated Sorted Array	Medium	Arrays; Binary Search	Sorting / Prefix / Scan; Binary Search	44.9%	62.5%	all
36	Valid Sudoku	Medium	Strings; Backtracking	Hashing / Sliding Window; Backtracking	64.5%	62.5%	all
72	Edit Distance	Medium	Dynamic Programming	State Transition	60.6%	62.5%	all
238	Product of Array Except Self	Medium	Arrays	Sorting / Prefix / Scan	68.9%	62.5%	all
283	Move Zeroes	Easy	Core DSA	Two Pointers	63.8%	62.5%	all
227	Basic Calculator II	Medium	Stack / Queue	Monotonic Stack / Simulation	46.9%	62.5%	all
994	Rotting Oranges	Medium	Core DSA	Implementation / Reasoning	58.7%	62.5%	all
45	Jump Game II	Medium	Greedy	Greedy	42.9%	62.5%	all
3853	Merge Close Characters	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	54.7%	62.5%	all
9	Palindrome Number	Easy	Strings	Hashing / Sliding Window	60.6%	50.0%	all
12	Integer to Roman	Medium	Strings	Hashing / Sliding Window	71.0%	50.0%	all
16	3Sum Closest	Medium	Arrays	Sorting / Prefix / Scan	48.6%	50.0%	all
17	Letter Combinations of a Phone Number	Medium	Strings; Backtracking	Hashing / Sliding Window; Backtracking	66.1%	50.0%	all
15	3Sum	Medium	Arrays	Sorting / Prefix / Scan	39.1%	50.0%	all
26	Remove Duplicates from Sorted Array	Easy	Arrays	Sorting / Prefix / Scan; Two Pointers	62.8%	50.0%	all
28	Find the Index of the First Occurrence in a String	Easy	Strings	Hashing / Sliding Window	46.7%	50.0%	all
4	Median of Two Sorted Arrays	Hard	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	46.6%	50.0%	all
39	Combination Sum	Medium	Arrays; Backtracking	Sorting / Prefix / Scan; Backtracking	76.5%	50.0%	all
38	Count and Say	Medium	Core DSA	Implementation / Reasoning	62.9%	50.0%	all
51	N-Queens	Hard	Backtracking	Backtracking	75.5%	50.0%	all
53	Maximum Subarray	Medium	Arrays	Sorting / Prefix / Scan	53.3%	50.0%	all
55	Jump Game	Medium	Greedy	Greedy	40.9%	50.0%	all
88	Merge Sorted Array	Easy	Arrays	Sorting / Prefix / Scan	54.9%	50.0%	all
91	Decode Ways	Medium	Dynamic Programming	State Transition	38.0%	50.0%	all
139	Word Break	Medium	Strings; Dynamic Programming	Hashing / Sliding Window; State Transition	49.5%	50.0%	all
151	Reverse Words in a String	Medium	Strings	Hashing / Sliding Window	56.4%	50.0%	all
171	Excel Sheet Column Number	Easy	Core DSA	Implementation / Reasoning	67.8%	50.0%	all
189	Rotate Array	Medium	Arrays	Sorting / Prefix / Scan	44.9%	50.0%	all
198	House Robber	Medium	Dynamic Programming	State Transition	53.2%	50.0%	all
205	Isomorphic Strings	Easy	Strings	Hashing / Sliding Window	48.4%	50.0%	all
1299	Replace Elements with Greatest Element on Right Side	Easy	Core DSA	Implementation / Reasoning	72.2%	50.0%	all
2221	Find Triangular Sum of an Array	Medium	Arrays	Sorting / Prefix / Scan	82.0%	50.0%	all
416	Partition Equal Subset Sum	Medium	Arrays; Dynamic Programming	Sorting / Prefix / Scan; State Transition	49.5%	50.0%	all
498	Diagonal Traverse	Medium	Core DSA	Implementation / Reasoning	67.2%	50.0%	all
735	Asteroid Collision	Medium	Core DSA	Implementation / Reasoning	47.9%	50.0%	all
84	Largest Rectangle in Histogram	Hard	Core DSA	Implementation / Reasoning	49.9%	50.0%	all
212	Word Search II	Hard	Strings; Binary Search	Hashing / Sliding Window; Binary Search	38.5%	50.0%	all
37	Sudoku Solver	Hard	Backtracking	Backtracking	65.5%	50.0%	all
217	Contains Duplicate	Easy	Arrays	Sorting / Prefix / Scan	64.4%	50.0%	all
85	Maximal Rectangle	Hard	Core DSA	Implementation / Reasoning	58.8%	50.0%	all
166	Fraction to Recurring Decimal	Medium	Core DSA	Implementation / Reasoning	30.9%	50.0%	all
451	Sort Characters By Frequency	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	75.3%	50.0%	all
118	Pascal's Triangle	Easy	Core DSA	Implementation / Reasoning	78.9%	50.0%	all
169	Majority Element	Easy	Core DSA	Implementation / Reasoning	66.3%	50.0%	all
125	Valid Palindrome	Easy	Strings	Hashing / Sliding Window	53.3%	50.0%	all
43	Multiply Strings	Medium	Strings	Hashing / Sliding Window	44.2%	50.0%	all
949	Largest Time for Given Digits	Medium	Core DSA	Implementation / Reasoning	35.9%	50.0%	all
73	Set Matrix Zeroes	Medium	Arrays	Sorting / Prefix / Scan	62.9%	50.0%	all
2	Add Two Numbers	Medium	Core DSA	Implementation / Reasoning	48.5%	50.0%	all
859	Buddy Strings	Easy	Strings	Hashing / Sliding Window	34.0%	50.0%	all
21	Merge Two Sorted Lists	Easy	Arrays; Linked List	Sorting / Prefix / Scan; Two Pointers	68.3%	50.0%	all
174	Dungeon Game	Hard	Core DSA	Implementation / Reasoning	41.4%	50.0%	all
215	Kth Largest Element in an Array	Medium	Arrays; Heap	Sorting / Prefix / Scan; Priority Queue	68.9%	50.0%	all
64	Minimum Path Sum	Medium	Arrays; Trees	Sorting / Prefix / Scan; DFS / BFS	68.2%	50.0%	all
1636	Sort Array by Increasing Frequency	Easy	Arrays	Sorting / Prefix / Scan	80.8%	50.0%	all
316	Remove Duplicate Letters	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	53.2%	50.0%	all
463	Island Perimeter	Easy	Graphs	BFS / DFS / Topological Sort	74.4%	50.0%	all
452	Minimum Number of Arrows to Burst Balloons	Medium	Arrays	Sorting / Prefix / Scan	61.4%	50.0%	all
347	Top K Frequent Elements	Medium	Heap	Priority Queue	66.4%	50.0%	all
540	Single Element in a Sorted Array	Medium	Arrays	Sorting / Prefix / Scan	59.3%	50.0%	all
134	Gas Station	Medium	Greedy	Greedy	48.0%	50.0%	all
1732	Find the Highest Altitude	Easy	Core DSA	Implementation / Reasoning	83.9%	50.0%	all
904	Fruit Into Baskets	Medium	Core DSA	Implementation / Reasoning	51.1%	50.0%	all
695	Max Area of Island	Medium	Graphs	BFS / DFS / Topological Sort	74.0%	50.0%	all
168	Excel Sheet Column Title	Easy	Core DSA	Implementation / Reasoning	46.5%	50.0%	all
860	Lemonade Change	Easy	Core DSA	Implementation / Reasoning	59.1%	50.0%	all
35	Search Insert Position	Easy	Binary Search	Binary Search	51.3%	37.5%	all
59	Spiral Matrix II	Medium	Arrays	Sorting / Prefix / Scan	75.1%	37.5%	all
75	Sort Colors	Medium	Arrays	Sorting / Prefix / Scan	69.6%	37.5%	all
78	Subsets	Medium	Backtracking	Backtracking	82.3%	37.5%	all
93	Restore IP Addresses	Medium	Core DSA	Implementation / Reasoning	56.0%	37.5%	all
122	Best Time to Buy and Sell Stock II	Medium	Core DSA	Implementation / Reasoning	71.1%	37.5%	all
128	Longest Consecutive Sequence	Medium	Core DSA	Implementation / Reasoning	47.1%	37.5%	all
202	Happy Number	Easy	Core DSA	Implementation / Reasoning	59.7%	37.5%	all
287	Find the Duplicate Number	Medium	Arrays	Sorting / Prefix / Scan	64.3%	37.5%	all
290	Word Pattern	Easy	Strings	Hashing / Sliding Window	44.1%	37.5%	all
322	Coin Change	Medium	Dynamic Programming	State Transition	48.4%	37.5%	all
345	Reverse Vowels of a String	Easy	Strings	Hashing / Sliding Window	61.3%	37.5%	all
1768	Merge Strings Alternately	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	82.1%	37.5%	all
1823	Find the Winner of the Circular Game	Medium	Core DSA	Implementation / Reasoning	82.2%	37.5%	all
1854	Maximum Population Year	Easy	Arrays	Sorting / Prefix / Scan	64.1%	37.5%	all
1047	Remove All Adjacent Duplicates In String	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	73.2%	37.5%	all
539	Minimum Time Difference	Medium	Arrays	Sorting / Prefix / Scan	62.6%	37.5%	all
829	Consecutive Numbers Sum	Hard	Arrays	Sorting / Prefix / Scan	42.7%	37.5%	all
8	String to Integer (atoi)	Medium	Strings	Hashing / Sliding Window	21.0%	37.5%	all
518	Coin Change II	Medium	Dynamic Programming	State Transition	60.0%	37.5%	all
488	Zuma Game	Hard	Core DSA	Implementation / Reasoning	29.7%	37.5%	all
443	String Compression	Medium	Strings	Hashing / Sliding Window	60.0%	37.5%	all
162	Find Peak Element	Medium	Binary Search	Binary Search	47.0%	37.5%	all
916	Word Subsets	Medium	Strings; Backtracking	Hashing / Sliding Window; Backtracking	55.9%	37.5%	all
97	Interleaving String	Medium	Strings	Hashing / Sliding Window	44.0%	37.5%	all
2305	Fair Distribution of Cookies	Medium	Core DSA	Implementation / Reasoning	69.9%	37.5%	all
2133	Check if Every Row and Column Contains All Numbers	Easy	Core DSA	Implementation / Reasoning	54.1%	37.5%	all
1512	Number of Good Pairs	Easy	Core DSA	Implementation / Reasoning	89.8%	37.5%	all
349	Intersection of Two Arrays	Easy	Arrays	Sorting / Prefix / Scan	77.8%	37.5%	all
1353	Maximum Number of Events That Can Be Attended	Medium	Arrays	Sorting / Prefix / Scan	39.0%	37.5%	all
76	Minimum Window Substring	Hard	Arrays; Strings; Trees	Sorting / Prefix / Scan; Hashing / Sliding Window; DFS / BFS; Sliding Window	47.5%	37.5%	all
328	Odd Even Linked List	Medium	Linked List	Two Pointers	62.5%	37.5%	all
1781	Sum of Beauty of All Substrings	Medium	Arrays; Strings; Trees	Sorting / Prefix / Scan; Hashing / Sliding Window; DFS / BFS	74.0%	37.5%	all
1963	Minimum Number of Swaps to Make the String Balanced	Medium	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	78.0%	37.5%	all
796	Rotate String	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	66.6%	37.5%	all
542	01 Matrix	Medium	Arrays	Sorting / Prefix / Scan	53.9%	37.5%	all
767	Reorganize String	Medium	Strings	Hashing / Sliding Window	57.1%	37.5%	all
18	4Sum	Medium	Arrays	Sorting / Prefix / Scan	40.6%	37.5%	all
1108	Defanging an IP Address	Easy	Core DSA	Implementation / Reasoning	90.0%	37.5%	all
494	Target Sum	Medium	Arrays	Sorting / Prefix / Scan	52.2%	37.5%	all
516	Longest Palindromic Subsequence	Medium	Core DSA	Implementation / Reasoning	65.4%	37.5%	all
2824	Count Pairs Whose Sum is Less than Target	Easy	Arrays	Sorting / Prefix / Scan	87.7%	37.5%	all
925	Long Pressed Name	Easy	Core DSA	Implementation / Reasoning	32.9%	37.5%	all
420	Strong Password Checker	Hard	Strings	Hashing / Sliding Window	15.8%	37.5%	all
149	Max Points on a Line	Hard	Core DSA	Implementation / Reasoning	30.7%	37.5%	all
167	Two Sum II - Input Array Is Sorted	Medium	Arrays	Sorting / Prefix / Scan; Two Pointers	65.1%	37.5%	all
503	Next Greater Element II	Medium	Stack / Queue	Monotonic Stack / Simulation	68.4%	37.5%	all
279	Perfect Squares	Medium	Core DSA	Implementation / Reasoning	56.5%	37.5%	all
213	House Robber II	Medium	Dynamic Programming	State Transition	44.9%	37.5%	all
219	Contains Duplicate II	Easy	Arrays	Sorting / Prefix / Scan	51.3%	37.5%	all
1394	Find Lucky Integer in an Array	Easy	Arrays	Sorting / Prefix / Scan	75.5%	37.5%	all
1678	Goal Parser Interpretation	Easy	Core DSA	Implementation / Reasoning	88.1%	37.5%	all
387	First Unique Character in a String	Easy	Strings	Hashing / Sliding Window	65.5%	37.5%	all
392	Is Subsequence	Easy	Core DSA	Implementation / Reasoning	49.0%	37.5%	all
239	Sliding Window Maximum	Hard	Arrays	Sorting / Prefix / Scan; Sliding Window	48.8%	37.5%	all
455	Assign Cookies	Easy	Core DSA	Implementation / Reasoning	55.0%	37.5%	all
2965	Find Missing and Repeated Values	Easy	Arrays	Sorting / Prefix / Scan	83.2%	37.5%	all
557	Reverse Words in a String III	Easy	Strings	Hashing / Sliding Window	84.0%	37.5%	all
62	Unique Paths	Medium	Core DSA	Implementation / Reasoning	66.8%	37.5%	all
146	LRU Cache	Medium	Design	Data Structure Design	47.4%	37.5%	all
747	Largest Number At Least Twice of Others	Easy	Core DSA	Implementation / Reasoning	52.5%	37.5%	all
66	Plus One	Easy	Core DSA	Implementation / Reasoning	50.0%	37.5%	all
268	Missing Number	Easy	Arrays	Sorting / Prefix / Scan	72.0%	37.5%	all
242	Valid Anagram	Easy	Strings	Hashing / Sliding Window	68.1%	37.5%	all
34	Find First and Last Position of Element in Sorted Array	Medium	Arrays	Sorting / Prefix / Scan	48.9%	37.5%	all
704	Binary Search	Easy	Binary Search	Binary Search	60.9%	37.5%	all
402	Remove K Digits	Medium	Core DSA	Implementation / Reasoning	36.9%	37.5%	all
2114	Maximum Number of Words Found in Sentences	Easy	Arrays; Strings	Sorting / Prefix / Scan; Hashing / Sliding Window	86.7%	37.5%	all
207	Course Schedule	Medium	Graphs	BFS / DFS / Topological Sort	51.4%	37.5%	all
1185	Day of the Week	Easy	Core DSA	Implementation / Reasoning	59.2%	37.5%	all

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