Zoho LeetCode Questions

168 questions all-time · 54 easy · 94 medium · 20 hard

#	Problem	Difficulty	Frequency	Acceptance
1	Spiral Matrix Array, Matrix, Simulation	Medium	100	0.6%
2	Decode String String, Stack, Recursion	Medium	95	0.6%
3	Longest Substring Without Repeating Characters Hash Table, String, Sliding Window	Medium	90	0.4%
4	Best Time to Buy and Sell Stock Array, Dynamic Programming	Easy	89	0.6%
5	Valid Parentheses String, Stack	Easy	88	0.4%
6	Merge Intervals Array, Sorting	Medium	87	0.5%
7	Longest Palindromic Substring Two Pointers, String, Dynamic Programming	Medium	85	0.4%
8	Two Sum Array, Hash Table	Easy	84	0.6%
9	Trapping Rain Water Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack	Hard	82	0.7%
10	Group Anagrams Array, Hash Table, String, Sorting	Medium	82	0.7%
11	Climbing Stairs Math, Dynamic Programming, Memoization	Easy	82	0.5%
12	Compare Version Numbers Two Pointers, String	Medium	79	0.5%
13	Sort Even and Odd Indices Independently Array, Sorting	Easy	79	0.6%
14	Generate Parentheses String, Dynamic Programming, Backtracking	Medium	77	0.8%
15	Number of Islands Array, Depth-First Search, Breadth-First Search, Union-Find, Matrix	Medium	77	0.6%
16	Find Winner on a Tic Tac Toe Game Array, Hash Table, Matrix, Simulation	Easy	77	0.5%
17	Largest Number Array, String, Greedy, Sorting	Medium	77	0.4%
18	Daily Temperatures Array, Stack, Monotonic Stack	Medium	77	0.7%
19	Zigzag Conversion String	Medium	75	0.5%
20	Wildcard Matching String, Dynamic Programming, Greedy, Recursion	Hard	75	0.3%
21	Rotate Image Array, Math, Matrix	Medium	75	0.8%
22	Remove All Occurrences of a Substring String, Stack, Simulation	Medium	73	0.8%
23	Sqrt(x) Math, Binary Search	Easy	73	0.4%
24	Container With Most Water Array, Two Pointers, Greedy	Medium	70	0.6%
25	Regular Expression Matching String, Dynamic Programming, Recursion	Hard	70	0.3%
26	Count Monobit Integers Bit Manipulation, Enumeration	Easy	70	0.7%
27	Longest Common Prefix Array, String, Trie	Easy	68	0.5%
28	Longest Valid Parentheses String, Dynamic Programming, Stack	Hard	68	0.4%
29	Merge Close Characters Hash Table, String	Medium	68	0.5%
30	Roman to Integer Hash Table, Math, String	Easy	65	0.7%
31	Search in Rotated Sorted Array Array, Binary Search	Medium	65	0.5%
32	Move Zeroes Array, Two Pointers	Easy	65	0.6%
33	Basic Calculator II Math, String, Stack	Medium	65	0.5%
34	Rotting Oranges Array, Breadth-First Search, Matrix	Medium	65	0.6%
35	Angle Between Hands of a Clock Math	Medium	65	0.7%
36	Letter Combinations of a Phone Number Hash Table, String, Backtracking	Medium	61	0.7%
37	Valid Sudoku Array, Hash Table, Matrix	Medium	61	0.6%
38	Edit Distance String, Dynamic Programming	Medium	61	0.6%
39	Merge Sorted Array Array, Two Pointers, Sorting	Easy	61	0.6%
40	Non-overlapping Intervals Array, Dynamic Programming, Greedy, Sorting	Medium	61	0.6%
41	Jump Game II Array, Dynamic Programming, Greedy	Medium	61	0.4%
42	3Sum Array, Two Pointers, Sorting	Medium	57	0.4%
43	Maximum Subarray Array, Divide and Conquer, Dynamic Programming	Medium	57	0.5%
44	Jump Game Array, Dynamic Programming, Greedy	Medium	57	0.4%
45	Excel Sheet Column Number Math, String	Easy	57	0.7%
46	Replace Elements with Greatest Element on Right Side Array	Easy	57	0.7%
47	Product of Array Except Self Array, Prefix Sum	Medium	57	0.7%
48	Subarray Sum Equals K Array, Hash Table, Prefix Sum	Medium	57	0.5%
49	Add Two Numbers Linked List, Math, Recursion	Medium	57	0.5%
50	Island Perimeter Array, Depth-First Search, Breadth-First Search, Matrix	Easy	57	0.7%
51	Single Element in a Sorted Array Array, Binary Search	Medium	57	0.6%
52	Palindrome Number Math	Easy	51	0.6%
53	3Sum Closest Array, Two Pointers, Sorting	Medium	51	0.5%
54	Find the Index of the First Occurrence in a String Two Pointers, String, String Matching	Easy	51	0.5%
55	Median of Two Sorted Arrays Array, Binary Search, Divide and Conquer	Hard	51	0.5%
56	Count and Say String	Medium	51	0.6%
57	N-Queens Array, Backtracking	Hard	51	0.8%
58	Decode Ways String, Dynamic Programming	Medium	51	0.4%
59	Rotate Array Array, Math, Two Pointers	Medium	51	0.5%
60	Isomorphic Strings Hash Table, String	Easy	51	0.5%
61	Asteroid Collision Array, Stack, Simulation	Medium	51	0.5%
62	Word Search II Array, String, Backtracking, Trie, Matrix	Hard	51	0.4%
63	Pascal's Triangle Array, Dynamic Programming	Easy	51	0.8%
64	Multiply Strings Math, String, Simulation	Medium	51	0.4%
65	Merge Two Sorted Lists Linked List, Recursion	Easy	51	0.7%
66	Dungeon Game Array, Dynamic Programming, Matrix	Hard	51	0.4%
67	Kth Largest Element in an Array Array, Divide and Conquer, Sorting, Heap (Priority Queue), Quickselect	Medium	51	0.7%
68	Top K Frequent Elements Array, Hash Table, Divide and Conquer, Sorting, Heap (Priority Queue), Bucket Sort, Counting, Quickselect	Medium	51	0.7%
69	Gas Station Array, Greedy	Medium	51	0.5%
70	Excel Sheet Column Title Math, String	Easy	51	0.5%
71	Remove Duplicates from Sorted Array Array, Two Pointers	Easy	45	0.6%
72	Combination Sum Array, Backtracking	Medium	45	0.8%
73	Word Search Array, String, Backtracking, Depth-First Search, Matrix	Medium	45	0.5%
74	Reverse Words in a String Two Pointers, String	Medium	45	0.6%
75	Integer to English Words Math, String, Recursion	Hard	45	0.4%
76	Partition Equal Subset Sum Array, Dynamic Programming	Medium	45	0.5%
77	Diagonal Traverse Array, Matrix, Simulation	Medium	45	0.7%
78	Sudoku Solver Array, Hash Table, Backtracking, Matrix	Hard	45	0.7%
79	Contains Duplicate Array, Hash Table, Sorting	Easy	45	0.6%
80	Maximal Rectangle Array, Dynamic Programming, Stack, Matrix, Monotonic Stack	Hard	45	0.6%
81	Fraction to Recurring Decimal Hash Table, Math, String	Medium	45	0.3%
82	Sort Characters By Frequency Hash Table, String, Sorting, Heap (Priority Queue), Bucket Sort, Counting	Medium	45	0.8%
83	Majority Element Array, Hash Table, Divide and Conquer, Sorting, Counting	Easy	45	0.7%
84	Valid Palindrome Two Pointers, String	Easy	45	0.5%
85	Largest Time for Given Digits Array, String, Backtracking, Enumeration	Medium	45	0.4%
86	Set Matrix Zeroes Array, Hash Table, Matrix	Medium	45	0.6%
87	Buddy Strings Hash Table, String	Easy	45	0.3%
88	Minimum Path Sum Array, Dynamic Programming, Matrix	Medium	45	0.7%
89	Sort Array by Increasing Frequency Array, Hash Table, Sorting	Easy	45	0.8%
90	Remove Duplicate Letters String, Stack, Greedy, Monotonic Stack	Medium	45	0.5%
91	Minimum Number of Arrows to Burst Balloons Array, Greedy, Sorting	Medium	45	0.6%
92	Find the Highest Altitude Array, Prefix Sum	Easy	45	0.8%
93	Fruit Into Baskets Array, Hash Table, Sliding Window	Medium	45	0.5%
94	Max Area of Island Array, Depth-First Search, Breadth-First Search, Union-Find, Matrix	Medium	45	0.7%
95	Partitioning Into Minimum Number Of Deci-Binary Numbers String, Greedy	Medium	45	0.9%
96	Lemonade Change Array, Greedy	Easy	45	0.6%
97	Integer to Roman Hash Table, Math, String	Medium	36	0.7%
98	Search Insert Position Array, Binary Search	Easy	36	0.5%
99	Spiral Matrix II Array, Matrix, Simulation	Medium	36	0.8%
100	Subsets Array, Backtracking, Bit Manipulation	Medium	36	0.8%
101	Restore IP Addresses String, Backtracking	Medium	36	0.6%
102	Best Time to Buy and Sell Stock II Array, Dynamic Programming, Greedy	Medium	36	0.7%
103	Longest Consecutive Sequence Array, Hash Table, Union-Find	Medium	36	0.5%
104	Word Break Array, Hash Table, String, Dynamic Programming, Trie, Memoization	Medium	36	0.5%
105	House Robber Array, Dynamic Programming	Medium	36	0.5%
106	Happy Number Hash Table, Math, Two Pointers	Easy	36	0.6%
107	Find the Duplicate Number Array, Two Pointers, Binary Search, Bit Manipulation	Medium	36	0.6%
108	Word Pattern Hash Table, String	Easy	36	0.4%
109	Coin Change Array, Dynamic Programming, Breadth-First Search	Medium	36	0.5%
110	Reverse Vowels of a String Two Pointers, String	Easy	36	0.6%
111	Merge Strings Alternately Two Pointers, String	Easy	36	0.8%
112	Find the Winner of the Circular Game Array, Math, Recursion, Queue, Simulation	Medium	36	0.8%
113	Largest Rectangle in Histogram Array, Stack, Monotonic Stack	Hard	36	0.5%
114	Minimum Time Difference Array, Math, String, Sorting	Medium	36	0.6%
115	Consecutive Numbers Sum Math, Enumeration	Hard	36	0.4%
116	String to Integer (atoi) String	Medium	36	0.2%
117	Coin Change II Array, Dynamic Programming	Medium	36	0.6%
118	Zuma Game String, Dynamic Programming, Stack, Breadth-First Search, Memoization	Hard	36	0.3%
119	String Compression Two Pointers, String	Medium	36	0.6%
120	Find Peak Element Array, Binary Search	Medium	36	0.5%
121	Word Subsets Array, Hash Table, String	Medium	36	0.6%
122	Interleaving String String, Dynamic Programming	Medium	36	0.4%
123	Fair Distribution of Cookies Array, Dynamic Programming, Backtracking, Bit Manipulation, Bitmask	Medium	36	0.7%
124	Check if Every Row and Column Contains All Numbers Array, Hash Table, Matrix	Easy	36	0.5%
125	Number of Good Pairs Array, Hash Table, Math, Counting	Easy	36	0.9%
126	Intersection of Two Arrays Array, Hash Table, Two Pointers, Binary Search, Sorting	Easy	36	0.8%
127	Maximum Number of Events That Can Be Attended Array, Greedy, Sorting, Heap (Priority Queue)	Medium	36	0.4%
128	Minimum Window Substring Hash Table, String, Sliding Window	Hard	36	0.5%
129	Odd Even Linked List Linked List	Medium	36	0.6%
130	Sum of Beauty of All Substrings Hash Table, String, Counting	Medium	36	0.7%
131	Minimum Number of Swaps to Make the String Balanced Two Pointers, String, Stack, Greedy	Medium	36	0.8%
132	Rotate String String, String Matching	Easy	36	0.7%
133	01 Matrix Array, Dynamic Programming, Breadth-First Search, Matrix	Medium	36	0.5%
134	Reorganize String Hash Table, String, Greedy, Sorting, Heap (Priority Queue), Counting	Medium	36	0.6%
135	4Sum Array, Two Pointers, Sorting	Medium	36	0.4%
136	Defanging an IP Address String	Easy	36	0.9%
137	Target Sum Array, Dynamic Programming, Backtracking	Medium	36	0.5%
138	Longest Palindromic Subsequence String, Dynamic Programming	Medium	36	0.7%
139	Long Pressed Name Two Pointers, String	Easy	36	0.3%
140	Strong Password Checker String, Greedy, Heap (Priority Queue)	Hard	36	0.2%
141	Max Points on a Line Array, Hash Table, Math, Geometry	Hard	36	0.3%
142	Two Sum II - Input Array Is Sorted Array, Two Pointers, Binary Search	Medium	36	0.7%
143	Next Greater Element II Array, Stack, Monotonic Stack	Medium	36	0.7%
144	Perfect Squares Math, Dynamic Programming, Breadth-First Search	Medium	36	0.6%
145	House Robber II Array, Dynamic Programming	Medium	36	0.5%
146	Contains Duplicate II Array, Hash Table, Sliding Window	Easy	36	0.5%
147	Find Lucky Integer in an Array Array, Hash Table, Counting	Easy	36	0.8%
148	Combination Sum II Array, Backtracking	Medium	36	0.6%
149	First Unique Character in a String Hash Table, String, Queue, Counting	Easy	36	0.7%
150	N-Repeated Element in Size 2N Array Array, Hash Table	Easy	36	0.8%
151	Is Subsequence Two Pointers, String, Dynamic Programming	Easy	36	0.5%
152	Sliding Window Maximum Array, Queue, Sliding Window, Heap (Priority Queue), Monotonic Queue	Hard	36	0.5%
153	Assign Cookies Array, Two Pointers, Greedy, Sorting	Easy	36	0.6%
154	Find Missing and Repeated Values Array, Hash Table, Math, Matrix	Easy	36	0.8%
155	Reverse Words in a String III Two Pointers, String	Easy	36	0.8%
156	Distinct Subsequences String, Dynamic Programming	Hard	36	0.5%
157	Unique Paths Math, Dynamic Programming, Combinatorics	Medium	36	0.7%
158	LRU Cache Hash Table, Linked List, Design, Doubly-Linked List	Medium	36	0.5%
159	Largest Number At Least Twice of Others Array, Sorting	Easy	36	0.5%
160	Plus One Array, Math	Easy	36	0.5%
161	Missing Number Array, Hash Table, Math, Binary Search, Bit Manipulation, Sorting	Easy	36	0.7%
162	Valid Anagram Hash Table, String, Sorting	Easy	36	0.7%
163	Find First and Last Position of Element in Sorted Array Array, Binary Search	Medium	36	0.5%
164	Remove K Digits String, Stack, Greedy, Monotonic Stack	Medium	36	0.4%
165	Maximum Number of Words Found in Sentences Array, String	Easy	36	0.9%
166	Course Schedule Depth-First Search, Breadth-First Search, Graph Theory, Topological Sort	Medium	36	0.5%
167	Day of the Week Math	Easy	36	0.6%
168	First Missing Positive Array, Hash Table	Hard	36	0.4%

How to read this list

The tabs at the top split the questions by how recently people said they were asked in interviews. "Last 30 Days" is the past month, "Last 3 Months" is the past quarter, and so on. "All Time" is every question on record for this company.

Frequency is a score from 0 to 100 for how often a question showed up in that time window. A higher number means it came up more often, so the list starts with the most common questions first. Acceptance is the share of submissions that pass on LeetCode. Click any question to open it on LeetCode.