Sigmoid LeetCode Questions
14 questions all-time · 4 easy · 9 medium · 1 hard
| # | Problem | Difficulty | Frequency | Acceptance |
|---|---|---|---|---|
| 1 | Binary Tree Zigzag Level Order Traversal Tree, Breadth-First Search, Binary Tree | Medium | 100 | 0.6% |
| 2 | Best Time to Buy and Sell Stock Array, Dynamic Programming | Easy | 92 | 0.6% |
| 3 | Product of Array Except Self Array, Prefix Sum | Medium | 80 | 0.7% |
| 4 | Reverse Nodes in k-Group Linked List, Recursion | Hard | 80 | 0.7% |
| 5 | Boats to Save People Array, Two Pointers, Greedy, Sorting | Medium | 80 | 0.6% |
| 6 | Valid Parentheses String, Stack | Easy | 80 | 0.4% |
| 7 | Longest Substring Without Repeating Characters Hash Table, String, Sliding Window | Medium | 80 | 0.4% |
| 8 | Min Stack Stack, Design | Medium | 80 | 0.6% |
| 9 | Best Time to Buy and Sell Stock II Array, Dynamic Programming, Greedy | Medium | 80 | 0.7% |
| 10 | Move Zeroes Array, Two Pointers | Easy | 80 | 0.6% |
| 11 | Group Anagrams Array, Hash Table, String, Sorting | Medium | 80 | 0.7% |
| 12 | Longest Common Prefix Array, String, Trie | Easy | 80 | 0.5% |
| 13 | Coin Change Array, Dynamic Programming, Breadth-First Search | Medium | 80 | 0.5% |
| 14 | Rotting Oranges Array, Breadth-First Search, Matrix | Medium | 80 | 0.6% |
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.