Problem database last updated: June 20, 2025
4 problems · 2 Easy, 1 Medium, 1 Hard · Ranked #302 of 458
2 Easy
50% · avg 23%
1 Medium
25% · avg 59%
1 Hard
25% · avg 18%
Based on 4 reported problems, Fortinet interviews are slightly harder than average - 25% Hard vs 18% across all companies.
Compared to the industry average, Fortinet puts unusual emphasis on greedy (50% of problems, 5.9x the industry average), string (50% of problems, 1.8x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are string (50%), greedy (50%), hash-table (25%), heap-priority-queue (25%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Construct String With Repeat Limit You are given a string s and an integer repeatLimit. Construct a new string repeatLimitedString using the characters of s such that no letter appears more than... | Medium | Very Likely | hash-tablestringgreedy | Solve |
Valid Palindrome II Given a string s, return true if the s can be palindrome after deleting at most one character from it. | Easy | Very Likely | two-pointersstringgreedy | Solve |
Percentage of Users Attended a Contest Table: Users | Easy | Very Likely | database | Solve |
Number of Ways to Paint N × 3 Grid You have a grid of size n x 3 and you want to paint each cell of the grid with exactly one of the three colors: Red, Yellow, or Green while making sure that no... | Hard | Very Likely | dynamic-programming | Solve |
Construct String With Repeat Limit
SolveYou are given a string s and an integer repeatLimit. Construct a new string repeatLimitedString using the characters of s such that no letter appears more than...
Valid Palindrome II
SolveGiven a string s, return true if the s can be palindrome after deleting at most one character from it.
Number of Ways to Paint N × 3 Grid
SolveYou have a grid of size n x 3 and you want to paint each cell of the grid with exactly one of the three colors: Red, Yellow, or Green while making sure that no...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Fortinet interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Fortinet interviews focus heavily on string, greedy, hash-table 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. Fortinet 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.
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Fortinet has been reported to ask 4 distinct coding problems. The most common topics are string, greedy, hash-table. 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.
Based on 4 reported problems, Fortinet 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.
Start with the highest-frequency problems listed on this page. Focus on the core topics: string, greedy, hash-table. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
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