Atlassian Coding Interview Questions

Rank Teams by Votes

In a special ranking system, each voter gives a rank from highest to lowest to all teams participating in the competition.

Stock Price Fluctuation

You are given a stream of records about a particular stock. Each record contains a timestamp and the corresponding price of the stock at that timestamp.

All O`one Data Structure

Design a data structure to store the strings' count with the ability to return the strings with minimum and maximum counts.

High-Access Employees

You are given a 2D 0-indexed array of strings, accesstimes, with size n. For each i where 0 <= i <= n - 1, accesstimes[i][0] represents the name of an employee,...

Merge Intervals

Given an array of intervals where intervals[i] = [starti, endi], merge all overlapping intervals, and return an array of the non-overlapping intervals that cove...

Minimum Time to Visit a Cell In a Grid

You are given a m x n matrix grid consisting of non-negative integers where grid[row][col] represents the minimum time required to be able to visit the cell (ro...

Make Lexicographically Smallest Array by Swapping Elements

You are given a 0-indexed array of positive integers nums and a positive integer limit.

Smallest Missing Non-negative Integer After Operations

You are given a 0-indexed integer array nums and an integer value.

Verbal Arithmetic Puzzle

Given an equation, represented by words on the left side and the result on the right side.

Maximum Square Area by Removing Fences From a Field

There is a large (m - 1) x (n - 1) rectangular field with corners at (1, 1) and (m, n) containing some horizontal and vertical fences given in arrays hFences an...

Maximum Area of Longest Diagonal Rectangle

You are given a 2D 0-indexed integer array dimensions.

Maximum Good Subarray Sum

You are given an array nums of length n and a positive integer k.

Minimum Cost to Convert String I

You are given two 0-indexed strings source and target, both of length n and consisting of lowercase English letters. You are also given two 0-indexed character...

Find the Width of Columns of a Grid

You are given a 0-indexed m x n integer matrix grid. The width of a column is the maximum length of its integers.

Minimum Cost to Convert String II

You are given two 0-indexed strings source and target, both of length n and consisting of lowercase English characters. You are also given two 0-indexed string...

Number of Possible Sets of Closing Branches

There is a company with n branches across the country, some of which are connected by roads. Initially, all branches are reachable from each other by traveling...

Cherry Pickup

You are given an n x n grid representing a field of cherries, each cell is one of three possible integers.

Group Anagrams

Given an array of strings strs, group the anagrams together. You can return the answer in any order.

Longest String Chain

You are given an array of words where each word consists of lowercase English letters.

Text Justification

Given an array of strings words and a width maxWidth, format the text such that each line has exactly maxWidth characters and is fully (left and right) justifie...

Lowest Common Ancestor of a Binary Tree

Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree.

Longest Increasing Subsequence

Given an integer array nums, return the length of the longest strictly increasing subsequence.

Majority Element II

Given an integer array of size n, find all elements that appear more than ⌊ n/3 ⌋ times.

Best Time to Buy and Sell Stock

You are given an array prices where prices[i] is the price of a given stock on the ith day.

Koko Eating Bananas

Koko loves to eat bananas. There are n piles of bananas, the ith pile has piles[i] bananas. The guards have gone and will come back in h hours.

Can Place Flowers

You have a long flowerbed in which some of the plots are planted, and some are not. However, flowers cannot be planted in adjacent plots.

Top K Frequent Elements

Given an integer array nums and an integer k, return the k most frequent elements. You may return the answer in any order.

String Transformation

You are given two strings s and t of equal length n. You can perform the following operation on the string s:

Online Election

You are given two integer arrays persons and times. In an election, the ith vote was cast for persons[i] at time times[i].

The Time When the Network Becomes Idle

There is a network of n servers, labeled from 0 to n - 1. You are given a 2D integer array edges, where edges[i] = [ui, vi] indicates there is a message channel...

Russian Doll Envelopes

You are given a 2D array of integers envelopes where envelopes[i] = [wi, hi] represents the width and the height of an envelope.

Word Search

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

Two Sum

Given an array of integers nums and an integer target, return the indices of the two numbers that add up to target.

Longest Substring Without Repeating Characters

Given a string s, find the length of the longest substring without duplicate characters.

Longest Consecutive Sequence

Given an unsorted array of integers nums, return the length of the longest consecutive elements sequence.

Integer to Roman

Seven different symbols represent Roman numerals with the following values:

Merge Sorted Array

You are given two integer arrays nums1 and nums2, sorted in non-decreasing order, and two integers m and n, representing the number of elements in nums1 and num...

Jump Game II

You are given a 0-indexed array of integers nums of length n. You are initially positioned at index 0.

Pairs of Songs With Total Durations Divisible by 60

You are given a list of songs where the ith song has a duration of time[i] seconds.

Count Vowels Permutation

Given an integer n, your task is to count how many strings of length n can be formed under the following rules:

Nth Highest Salary

Table: Employee

Crawler Log Folder

The Leetcode file system keeps a log each time some user performs a change folder operation.

Boats to Save People

You are given an array people where people[i] is the weight of the ith person, and an infinite number of boats where each boat can carry a maximum weight of lim...

Maximum Number of Occurrences of a Substring

Given a string s, return the maximum number of occurrences of any substring under the following rules:

Design a Food Rating System

Design a food rating system that can do the following:

Unique Paths II

You are given an m x n integer array grid. There is a robot initially located at the top-left corner (i.e., grid[0][0]). The robot tries to move to the bottom-r...

Trapping Rain Water

Given n non-negative integers representing an elevation map where the width of each bar is 1, compute how much water it can trap after raining.

Coin Change

You are given an integer array coins representing coins of different denominations and an integer amount representing a total amount of money.

Find First and Last Position of Element in Sorted Array

Given an array of integers nums sorted in non-decreasing order, find the starting and ending position of a given target value.

Assign Cookies

Assume you are an awesome parent and want to give your children some cookies. But, you should give each child at most one cookie.

Container With Most Water

You are given an integer array height of length n. There are n vertical lines drawn such that the two endpoints of the ith line are (i, 0) and (i, height[i]).

Valid Anagram

Given two strings s and t, return true if t is an anagram of s, and false otherwise.

Maximum Subarray

Given an integer array nums, find the subarray with the largest sum, and return its sum.

3Sum

Given an integer array nums, return all the triplets [nums[i], nums[j], nums[k]] such that i != j, i != k, and j != k, and nums[i] + nums[j] + nums[k] == 0.

Single Element in a Sorted Array

You are given a sorted array consisting of only integers where every element appears exactly twice, except for one element which appears exactly once.

Last Day Where You Can Still Cross

There is a 1-based binary matrix where 0 represents land and 1 represents water. You are given integers row and col representing the number of rows and columns...

Find Words That Can Be Formed by Characters

You are given an array of strings words and a string chars.

Count Vowel Strings in Ranges

You are given a 0-indexed array of strings words and a 2D array of integers queries.

Design Add and Search Words Data Structure

Design a data structure that supports adding new words and finding if a string matches any previously added string.

Maximum Path Quality of a Graph

There is an undirected graph with n nodes numbered from 0 to n - 1 (inclusive). You are given a 0-indexed integer array values where values[i] is the value of t...

Tallest Billboard

You are installing a billboard and want it to have the largest height. The billboard will have two steel supports, one on each side. Each steel support must be...

Add Two Integers

Given two integers num1 and num2, return the sum of the two integers.

Find K Closest Elements

Given a sorted integer array arr, two integers k and x, return the k closest integers to x in the array. The result should also be sorted in ascending order.

Number of Digit One

Given an integer n, count the total number of digit 1 appearing in all non-negative integers less than or equal to n.

Kth Largest Element in a Stream

You are part of a university admissions office and need to keep track of the kth highest test score from applicants in real-time. This helps to determine cut-of...

Search Suggestions System

You are given an array of strings products and a string searchWord.