How often are these problems asked?
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent SOTI interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Problem database last updated: June 20, 2025
S
SOTI Coding Interview Questions
4 problems · 2 Easy, 1 Medium, 1 Hard · Ranked #263 of 458
Difficulty breakdown
2 Easy
50% · avg 23%
1 Medium
25% · avg 59%
1 Hard
25% · avg 18%
Top topics
string
75%2.7x
stack
50%5.8x
dynamic-programming
25%
hash-table
25%
sliding-window
25%5.3x
array
25%
Interview profile
Based on 4 reported problems, SOTI interviews are slightly harder than average - 25% Hard vs 18% across all companies.
Compared to the industry average, SOTI puts unusual emphasis on stack (50% of problems, 5.8x the industry average), string (75% of problems, 2.7x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are string (75%), stack (50%), dynamic-programming (25%), hash-table (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
All 4 problems
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Longest Valid Parentheses Given a string containing just the characters '(' and ')', return the length of the longest valid (well-formed) parentheses substring. | Hard | Very Likely | stringdynamic-programmingstack | Solve |
Longest Substring Without Repeating Characters Given a string s, find the length of the longest substring without duplicate characters. | Medium | Very Likely | hash-tablestringsliding-window | Solve |
Valid Parentheses Given a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid. | Easy | Very Likely | stringstack | Solve |
Can Place Flowers You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots. | Easy | Very Likely | arraygreedy | Solve |
Longest Valid Parentheses
SolveGiven a string containing just the characters '(' and ')', return the length of the longest valid (well-formed) parentheses substring.
HardVery Likely
stringdynamic-programmingstack
Longest Substring Without Repeating Characters
SolveGiven a string s, find the length of the longest substring without duplicate characters.
MediumVery Likely
hash-tablestringsliding-window
Valid Parentheses
SolveGiven a string s containing just the characters '(', ')', '{', '}', '[' and ']', determine if the input string is valid.
EasyVery Likely
stringstack
Can Place Flowers
SolveYou have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots.
EasyVery Likely
arraygreedy
Preparing for your SOTI coding interview
SOTI interviews focus heavily on string, stack, dynamic-programming problems. If you're short on time, these are the categories to prioritize. The problems on this page are sorted by frequency, so start from the top and work your way down.
Beyond solving problems, practice explaining your approach. SOTI interviewers care about your thought process - how you break down a problem, consider edge cases, and evaluate tradeoffs between solutions. A clean O(n) solution you can explain clearly beats an O(log n) solution you can't articulate.
Looking for more companies? Browse all 458 companies in our directory, or sharpen your fundamentals with our free data structure visualizers and AI-powered DSA tutor.
Frequently Asked Questions
What coding problems does SOTI ask in interviews?add
SOTI has been reported to ask 4 distinct coding problems. The most common topics are string, stack, dynamic-programming. 2 are Easy difficulty, 1 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
How hard are SOTI coding interviews?add
Based on 4 reported problems, SOTI interviews are slightly harder than average - 25% Hard vs 18% across all companies. 25% of questions are Medium difficulty. Focus on the high-frequency Medium problems first, then work through the Hard ones.
How should I prepare for a SOTI coding interview?add
Start with the highest-frequency problems listed on this page. Focus on the core topics: string, stack, dynamic-programming. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Other companies to explore
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