Problem database last updated: June 20, 2025
3 problems · 2 Easy, 0 Medium, 1 Hard · Ranked #328 of 458
2 Easy
67% · avg 23%
0 Medium
0% · avg 59%
1 Hard
33% · avg 18%
Based on 3 reported problems, Citigroup interviews are significantly harder than average - 33% Hard vs 18% across all companies.
Compared to the industry average, Citigroup puts unusual emphasis on array (100% of problems, 1.7x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (100%), dynamic-programming (33.3%), prefix-sum (33.3%), stack (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Best Time to Buy and Sell Stock You are given an array prices where prices[i] is the price of a given stock on the ith day. | Easy | Very Likely | arraydynamic-programming | Solve |
Find Pivot Index Given an array of integers nums, calculate the pivot index of this array. | Easy | Very Likely | arrayprefix-sum | Solve |
Number of Visible People in a Queue There are n people standing in a queue, and they numbered from 0 to n - 1 in left to right order. You are given an array heights of distinct integers where heig... | Hard | Very Likely | arraystackmonotonic-stack | Solve |
Best Time to Buy and Sell Stock
SolveYou are given an array prices where prices[i] is the price of a given stock on the ith day.
Find Pivot Index
SolveGiven an array of integers nums, calculate the pivot index of this array.
Number of Visible People in a Queue
SolveThere are n people standing in a queue, and they numbered from 0 to n - 1 in left to right order. You are given an array heights of distinct integers where heig...
Frequency scores are based on crowdsourced interview reports. A higher score means the problem has been reported more often in recent Citigroup interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Citigroup interviews focus heavily on array, dynamic-programming, prefix-sum 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. Citigroup 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.
Citigroup has been reported to ask 3 distinct coding problems. The most common topics are array, dynamic-programming, prefix-sum. 2 are Easy difficulty, 0 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
Based on 3 reported problems, Citigroup interviews are significantly harder than average - 33% Hard vs 18% across all companies. 0% 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: array, dynamic-programming, prefix-sum. Practice solving them under time pressure and explaining your approach out loud. Mock interviews with AI can simulate the real experience.
Simulate a real Citigroup coding interview with an AI interviewer. Get a scorecard with specific feedback on your problem-solving, code quality, and communication.
Simulate a Citigroup interview with AIarrow_forward
