Coding Interview Questions

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638 questions
547 companies
27 roles
Last updated Nov 2026

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In SQL or Python, select the maximum price for each single name, then the k-th largest price for each single name.
3 days ago
Implement a vector by hand in C++.
+43 days ago
Implement std::variant from scratch: storage, type-index lookup, construction from any alternative, destruction of the active member and typed access.
3 years ago
Each named move is defined by a sequence of inputs. Write one function to register a move and another that, as inputs arrive, detects a move as soon as its sequence has been entered.
3 days ago
Implement a C++ class, constructed from an istream, whose begin() and end() return input iterators over the valid integers in a file of one value per line.
3 days ago
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How would you implement a function that computes pi using numbers drawn from a uniform distribution?
3 years ago
Write an API that takes a string of records, each a two-character length followed by a message of that length, and prints the concatenated messages.
3 days ago
Write a producer class that batches messages before sending them to a network endpoint, given a maximum number of held messages and a maximum time any message may be held.
3 days ago
Implement a rolling mean and rolling variance over a data stream with O(1) work per update.
+13 days ago
Write a function that, given a target stock allocation of X% with the rest in bonds and a drift threshold of Y%, returns the stock drawdown that would trigger a rebalance.
3 days ago
Two vendors each send a timestamped stream of trades for the same stocks, and two records match when price and quantity agree. Write code to compare the feeds, first in batch and then as live streams.
3 years ago
Given time-sorted temperature and humidity readings tagged by city, find for each temperature reading the most recent humidity reading from the same city.
2 years ago
Add two non-negative integers given as digit strings and return the sum, and explain the time and space complexity of your approach.
10 months ago
Given a day's buy and sell orders for one stock as (amount, time) pairs, with the position starting and ending at 0, compute the average time a share is held.
3 days ago
Simulate a ball in a walled maze on a board that is tilted up, down, left, right or flat at given times, and return the ball's position at a given end time.
10 months ago
Build a Rock, Paper, Scissors game using the visitor design pattern.
10 months ago
Events are published to re-fire at a fixed interval between a start and an end time and can be unpublished. After each operation, return how many events have fired so far.
2 years ago
Implement wildcard matching: decide whether a string matches a pattern in which '?' matches any single character and '*' matches any sequence of characters, including none.
3 days ago
Find the largest sum of any contiguous subarray of an integer array. Then reduce the extra space to O(1).
3 days ago
How does the loading speed of a CSV file compare with that of a Parquet file, and how does each scale with file size?
2 years ago

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Coding Interview Questions

In SQL or Python, select the maximum price for each single name, then the k-th largest price for each single name.

Implement a vector by hand in C++.

Implement std::variant from scratch: storage, type-index lookup, construction from any alternative, destruction of the active member and typed access.

Each named move is defined by a sequence of inputs. Write one function to register a move and another that, as inputs arrive, detects a move as soon as its sequence has been entered.

Implement a C++ class, constructed from an istream, whose begin() and end() return input iterators over the valid integers in a file of one value per line.

How would you implement a function that computes pi using numbers drawn from a uniform distribution?

Write an API that takes a string of records, each a two-character length followed by a message of that length, and prints the concatenated messages.

Write a producer class that batches messages before sending them to a network endpoint, given a maximum number of held messages and a maximum time any message may be held.

Implement a rolling mean and rolling variance over a data stream with O(1) work per update.

Write a function that, given a target stock allocation of X% with the rest in bonds and a drift threshold of Y%, returns the stock drawdown that would trigger a rebalance.

Two vendors each send a timestamped stream of trades for the same stocks, and two records match when price and quantity agree. Write code to compare the feeds, first in batch and then as live streams.

Given time-sorted temperature and humidity readings tagged by city, find for each temperature reading the most recent humidity reading from the same city.

Add two non-negative integers given as digit strings and return the sum, and explain the time and space complexity of your approach.

Given a day's buy and sell orders for one stock as (amount, time) pairs, with the position starting and ending at 0, compute the average time a share is held.

Simulate a ball in a walled maze on a board that is tilted up, down, left, right or flat at given times, and return the ball's position at a given end time.

Build a Rock, Paper, Scissors game using the visitor design pattern.

Events are published to re-fire at a fixed interval between a start and an end time and can be unpublished. After each operation, return how many events have fired so far.

Implement wildcard matching: decide whether a string matches a pattern in which '?' matches any single character and '*' matches any sequence of characters, including none.

Find the largest sum of any contiguous subarray of an integer array. Then reduce the extra space to O(1).

How does the loading speed of a CSV file compare with that of a Parquet file, and how does each scale with file size?

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