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 Nokia interviews.
Very Likely
75-100%
Likely
50-74%
Sometimes
25-49%
Rare
0-24%
Problem database last updated: June 20, 2025
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Nokia Coding Interview Questions
6 problems · 3 Easy, 2 Medium, 1 Hard · Ranked #209 of 458
Difficulty breakdown
3 Easy
50% · avg 23%
2 Medium
33% · avg 59%
1 Hard
17% · avg 18%
Top topics
array
66.7%
sorting
33.3%2.3x
string
33.3%
hash-table
33.3%1.5x
math
33.3%2.6x
number-theory
33.3%65x
Interview profile
Based on 6 reported problems, Nokia interviews are in line with industry averages - 17% Hard vs 18% overall.
Compared to the industry average, Nokia puts unusual emphasis on number-theory (33.3% of problems, 65x the industry average), math (33.3% of problems, 2.6x the industry average), sorting (33.3% of problems, 2.3x the industry average). If you're short on time, these are the categories to double down on.
The most common topics are array (66.7%), sorting (33.3%), string (33.3%), hash-table (33.3%). Problems below are sorted by frequency, the ones at the top are asked most often.
All 6 problems
| Problem | Difficulty | Frequency | Topics | |
|---|---|---|---|---|
Minimum Cost of Buying Candies With Discount A shop is selling candies at a discount. For every two candies sold, the shop gives a third candy for free. | Easy | Very Likely | arraygreedysorting | Solve |
Longest Common Prefix Write a function to find the longest common prefix string amongst an array of strings. | Easy | Very Likely | arraystringtrie | Solve |
Valid Anagram Given two strings s and t, return true if t is an anagram of s, and false otherwise. | Easy | Very Likely | hash-tablestringsorting | Solve |
Count Primes Given an integer n, return the number of prime numbers that are strictly less than n. | Medium | Very Likely | arraymathenumeration | Solve |
LRU Cache Design a data structure that follows the constraints of a Least Recently Used (LRU) cache. | Medium | Very Likely | hash-tablelinked-listdesign | Solve |
Check If It Is a Good Array Given an array nums of positive integers. Your task is to select some subset of nums, multiply each element by an integer and add all these numbers. The array i... | Hard | Very Likely | arraymathnumber-theory | Solve |
Minimum Cost of Buying Candies With Discount
SolveA shop is selling candies at a discount. For every two candies sold, the shop gives a third candy for free.
EasyVery Likely
arraygreedysorting
Longest Common Prefix
SolveWrite a function to find the longest common prefix string amongst an array of strings.
EasyVery Likely
arraystringtrie
Valid Anagram
SolveGiven two strings s and t, return true if t is an anagram of s, and false otherwise.
EasyVery Likely
hash-tablestringsorting
Count Primes
SolveGiven an integer n, return the number of prime numbers that are strictly less than n.
MediumVery Likely
arraymathenumeration
LRU Cache
SolveDesign a data structure that follows the constraints of a Least Recently Used (LRU) cache.
MediumVery Likely
hash-tablelinked-listdesign
Check If It Is a Good Array
SolveGiven an array nums of positive integers. Your task is to select some subset of nums, multiply each element by an integer and add all these numbers. The array i...
HardVery Likely
arraymathnumber-theory
Preparing for your Nokia coding interview
Nokia interviews focus heavily on array, sorting, string 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. Nokia 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 Nokia ask in interviews?add
Nokia has been reported to ask 6 distinct coding problems. The most common topics are array, sorting, string. 3 are Easy difficulty, 2 are Medium, and 1 are Hard. Problems are sorted by frequency - the ones at the top are asked most often.
How hard are Nokia coding interviews?add
Based on 6 reported problems, Nokia interviews are in line with industry averages - 17% Hard vs 18% overall. 33% 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 Nokia coding interview?add
Start with the highest-frequency problems listed on this page. Focus on the core topics: array, sorting, string. 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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