Coding Interview Questions

Review this list of 490 Coding interview questions and answers verified by hiring managers and candidates.

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Implement regular expression matching for a string and pattern, where . matches any single character and * matches zero or more of the preceding element.
7 months ago
Remove duplicates in an array of objects.
a year ago
Determine if an array of integers from 1 to n contains a duplicate in constant time and space.
2 years ago2 answers
Find the longest palindromic subsequence using dynamic programming.
+36 months ago10 answers
Given the root of a binary tree, return the vertical order traversal of its node values from top to bottom, column by column. Nodes in the same row and column should be ordered left to right.
5 months ago
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Find a local minima in an array Last Updated
a year ago1 answer
Given two empty jugs with capacities a and b liters and an infinite water supply, determine a way to end up with exactly X liters of water.
2 years ago1 answer
Implement a leaderboard that maintains the best score player at the top and gets any player in O(1) time.
2 years ago
Given an array of n integers and a number k, find the maximum number of elements whose sum is less than k, and return their sum.
2 years ago1 answer
Biased Coin Flip Histogram
3 answers
Determine the minimum number of parentheses needed to balance a given string.
3 years ago
Array Manipulation: Given an array, implement functions to perform add, remove, update operations and return the resulting array.
a year ago
Given a large n-ary tree where the root node can pass information to one child per iteration, and in subsequent iterations, nodes can pass information to one child while the root continues with others, find the minimum number of iterations to reach all nodes.
4 years ago1 answer
Rank Salary by Department
5 answers
Find the length of the shortest word ladder.
2 years ago
Determine if a number is a power of two.
2 years ago2 answers
Implement a card game with classes like car/card and player, including functionality like shuffling and assigning cards to players.
7 months ago
Given an array of daily stock returns and at most k deletions, determine the maximum number of contiguous days with the same return value after omitting up to k days.
7 months ago
Find the smallest missing element from a sorted array.
5 years ago1 answer
Review the given code for a React.js based Tic-tac-toe game written in Typescript and suggest improvements.
2 years ago1 answer

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Coding Interview Questions

Implement regular expression matching for a string and pattern, where . matches any single character and * matches zero or more of the preceding element.

Remove duplicates in an array of objects.

Determine if an array of integers from 1 to n contains a duplicate in constant time and space.

Find the longest palindromic subsequence using dynamic programming.

Given the root of a binary tree, return the vertical order traversal of its node values from top to bottom, column by column. Nodes in the same row and column should be ordered left to right.

Find a local minima in an array Last Updated

Given two empty jugs with capacities a and b liters and an infinite water supply, determine a way to end up with exactly X liters of water.

Implement a leaderboard that maintains the best score player at the top and gets any player in O(1) time.

Given an array of n integers and a number k, find the maximum number of elements whose sum is less than k, and return their sum.

Biased Coin Flip Histogram

Determine the minimum number of parentheses needed to balance a given string.

Array Manipulation: Given an array, implement functions to perform add, remove, update operations and return the resulting array.

Given a large n-ary tree where the root node can pass information to one child per iteration, and in subsequent iterations, nodes can pass information to one child while the root continues with others, find the minimum number of iterations to reach all nodes.

Rank Salary by Department

Find the length of the shortest word ladder.

Determine if a number is a power of two.

Implement a card game with classes like car/card and player, including functionality like shuffling and assigning cards to players.

Given an array of daily stock returns and at most k deletions, determine the maximum number of contiguous days with the same return value after omitting up to k days.

Find the smallest missing element from a sorted array.

Review the given code for a React.js based Tic-tac-toe game written in Typescript and suggest improvements.

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