The word hackathon combines hack with which other word?
AnswerMarathon
Hackathon blends hack and marathon, reflecting long, focused building sessions.
Coding · Facts & stats
Challenge Hack facts & stats
7 fact-checked facts about hackathons and coding challenges, each with the reason behind it. 5 more are in today's round and join this page after it closes.
The basics
What is an algorithm?
AnswerA step-by-step procedure for solving a problem
An algorithm is a finite set of clear steps that solves a problem or completes a task.
Going deeper
What is the time complexity of binary search on a sorted list?
AnswerO(log n)
Binary search halves the search range each step, giving logarithmic time.
In 1947, what was found in the Harvard Mark II computer and taped into its logbook as a "bug"?
AnswerA moth
Operators logged the moth as the "first actual case of bug being found."
Which data structure follows Last In, First Out order?
AnswerA stack
In a stack, the last item added is the first removed, like a pile of plates.
Expert level
What is the minimum number of moves to solve the Tower of Hanoi with 3 disks?
Answer7
The minimum is 2 to the power of n minus 1; for 3 disks that is 7.
What is the worst-case time complexity of bubble sort?
AnswerO(n squared)
Bubble sort may compare every pair of items, taking quadratic time in the worst case.
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