Zopsmart LeetCode Questions

17 questions all-time · 3 easy · 12 medium · 2 hard

#	Problem	Difficulty	Frequency	Acceptance
1	Zigzag Conversion String	Medium	100	0.5%
2	Trapping Rain Water Array, Two Pointers, Dynamic Programming, Stack, Monotonic Stack	Hard	84	0.7%
3	Decode String String, Stack, Recursion	Medium	82	0.6%
4	Reverse Nodes in Even Length Groups Linked List	Medium	77	0.6%
5	Hexadecimal and Hexatrigesimal Conversion Math, String	Easy	77	0.8%
6	Bulls and Cows Hash Table, String, Counting	Medium	64	0.5%
7	Remove K Digits String, Stack, Greedy, Monotonic Stack	Medium	60	0.4%
8	Reverse Words in a String Two Pointers, String	Medium	60	0.6%
9	Letter Combinations of a Phone Number Hash Table, String, Backtracking	Medium	55	0.7%
10	Broken Calculator Math, Greedy	Medium	55	0.6%
11	Fraction Addition and Subtraction Math, String, Simulation	Medium	47	0.7%
12	Container With Most Water Array, Two Pointers, Greedy	Medium	47	0.6%
13	Longest Palindromic Substring Two Pointers, String, Dynamic Programming	Medium	47	0.4%
14	Valid Anagram Hash Table, String, Sorting	Easy	47	0.7%
15	Longest Common Prefix Array, String, Trie	Easy	47	0.5%
16	Restore IP Addresses String, Backtracking	Medium	47	0.6%
17	Reverse Nodes in k-Group Linked List, Recursion	Hard	47	0.7%

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.