Coding Interview Questions

Review this list of 458 Coding interview questions and answers verified by hiring managers and candidates.

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Given an m x n grid of characters board and a string word, return true if word exists in the grid.
a month ago
Product of Array Except Self Has video answer
+3a year ago68 answers
Given a factory represented as a 2D grid with some cells blocked and some containing robots, determine if the robots can collectively reach all unblocked cells.
9 months ago2 answers
Most Common Words
8 months ago33 answers
Find the closest palindrome of a given number.
7 months ago2 answers
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Find Top Customer by Year
2 years ago17 answers
Given an org chart tree, compute each employee's level, identify balanced employees, and build a histogram of employees by level.
2 months ago
Most Recent Transaction
10 months ago28 answers
Given an array of points and a point P, find the k closest points to P.
a year ago7 answers
E-commerce (1 of 5) Has video answer
3 years ago19 answers
Build a chatbot-style chat interface using classes.
a month ago
Find the median from a data stream.
5 months ago1 answer
Build an image carousel that displays a sequence of images (using React.js or vanilla JS). Has video answer
2 years ago2 answers
Find the Duplicates
2 years ago35 answers
Implement k-means clustering. Has video answer
+1a year ago2 answers
Given a head node of a linked list, delete k-th node from the end of the list.
a year ago5 answers
Write functions to serialize and deserialize a list of strings. Has video answer
2 years ago7 answers
Given a train schedule with departure city, arrival city, start time, end time, and duration, and given a source and destination, find the sequence of trains that gets you there at the earliest possible time.
3 months ago
Explain multithreading.
2 years ago3 answers
Given the root of a binary tree, return the length of the diameter of the tree.
6 months ago13 answers

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Coding Interview Questions

Given an m x n grid of characters board and a string word, return true if word exists in the grid.

Product of Array Except Self Has video answer

Given a factory represented as a 2D grid with some cells blocked and some containing robots, determine if the robots can collectively reach all unblocked cells.

Most Common Words

Find the closest palindrome of a given number.

Find Top Customer by Year

Given an org chart tree, compute each employee's level, identify balanced employees, and build a histogram of employees by level.

Most Recent Transaction

Given an array of points and a point P, find the k closest points to P.

E-commerce (1 of 5) Has video answer

Build a chatbot-style chat interface using classes.

Find the median from a data stream.

Build an image carousel that displays a sequence of images (using React.js or vanilla JS). Has video answer

Find the Duplicates

Implement k-means clustering. Has video answer

Given a head node of a linked list, delete k-th node from the end of the list.

Write functions to serialize and deserialize a list of strings. Has video answer

Given a train schedule with departure city, arrival city, start time, end time, and duration, and given a source and destination, find the sequence of trains that gets you there at the earliest possible time.

Explain multithreading.

Given the root of a binary tree, return the length of the diameter of the tree.

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