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Citadel Coding Interview Questions

We track 91 coding questions asked at Citadel, tagged with the algorithms and concepts they test. The most common: Array, Dynamic Programming, String, Hash Table, Math.

Browse all 91 Citadel questions →

Concept mix

Each question's weight is split evenly across its concepts, so the shares sum to 100%.

Array — 17.1%Dynamic Programming — 10.8%String — 7.7%Hash Table — 7.0%Math — 5.8%Binary Search — 3.8%Breadth-First Search — 3.4%Design — 3.4%Two Pointers — 3.3%Depth-First Search — 2.9%Other (37) — 34.5%

How many questions involve each concept

Share of all 91 tracked Citadel questions that touch each concept. Questions usually involve several, so these overlap.

Where Citadel differs from the average company

Concept weight at Citadel relative to the average across all companies we track. Green means Citadel leans on it harder than most.

Citadel specialties

Concepts that show up at Citadel but are rarely asked elsewhere. They are easy to get blindsided by.

Difficulty mix

Level split of the 91 tracked Citadel questions.

  • Junior7% (6)
  • Mid/Senior64% (58)
  • Staff30% (27)

Every concept in Citadel interviews

ConceptQuestions% of questionsShare of mix
Array4650.5%17.1%
Dynamic Programming2224.2%10.8%
String2224.2%7.7%
Hash Table2123.1%7.0%
Math1415.4%5.8%
Breadth-First Search1112.1%3.4%
Depth-First Search1112.1%2.9%
Design1112.1%3.4%
Binary Search1011.0%3.8%
Sorting99.9%2.4%
Two Pointers99.9%3.3%
Graph Theory88.8%2.1%
Heap (Priority Queue)88.8%2.1%
Matrix88.8%2.4%
Backtracking77.7%2.9%
Linked List55.5%1.5%
Topological Sort55.5%1.5%
Binary Tree44.4%1.2%
Greedy44.4%1.2%
Sliding Window44.4%1.2%
Stack44.4%1.9%
Tree44.4%1.2%
Union-Find44.4%0.9%
Bit Manipulation33.3%0.9%
Counting33.3%0.8%
Doubly-Linked List33.3%0.8%
Queue33.3%0.8%
Simulation33.3%1.1%
Data Stream22.2%0.5%
Divide and Conquer22.2%0.7%
Enumeration22.2%0.6%
Geometry22.2%0.6%
Randomized22.2%0.6%
Recursion22.2%1.0%
Trie22.2%0.5%
Binary Search Tree11.1%0.3%
Eulerian Circuit11.1%0.2%
Hash Function11.1%0.2%
Memoization11.1%0.4%
Merge Sort11.1%0.3%
Monotonic Queue11.1%0.2%
Monotonic Stack11.1%0.2%
Number Theory11.1%0.3%
Ordered Set11.1%0.3%
Prefix Sum11.1%0.3%
Rolling Hash11.1%0.2%
Shortest Path11.1%0.2%

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