# DoorDash Interview Questions

DoorDash, Inc. is an American company that operates an online food ordering and food delivery platform. The company is based in San Francisco, California. It went public in December 2020 on NYSE and trades under the symbol DASH. With a 56% market share, it is the largest food delivery company in the United States.

It has got a 3.8* rating on Glassdoor and is considered one of the best product-based companies. It is highly regarded for its work-life balance.

They provide good training as well which will be beneficial in future too. You can practice the below DoorDash Interview Questions for the interview. We have collected past frequently asked DoorDash Interview Questions for your reference.

## DoorDash Array Questions

Question 1. Next Permutation Leetcode Solution Problem Statement The Next Permutation LeetCode Solution – “Next Permutation” states that given an array of integers which is a permutation of first n natural numbers. We need to find the next lexicographically smallest permutation of the given array. The replacement must be in-place and use only constant extra space. ...

Question 2. Maximum Profit in Job Scheduling Leetcode Solution Problem Statement The Maximum Profit in Job Scheduling LeetCode Solution – “Maximum Profit in Job Scheduling” states that you’re given n jobs where each job starts from startTime[i] and ends at endTime[i] and obtaining the profit of profit[i]. We need to return the maximum profit that we can have such ...

Question 3. Max Area of Island Problem Description: Given a 2D matrix, the matrix has only 0(representing water)  and 1(representing land) as entries. An island in the matrix is formed by grouping all the adjacent 1’s connected 4-directionally(horizontal and vertical). Find the maximum area of the island in the matrix. Assume that all four edges of ...

Question 4. Count of Triplets With Sum Less than Given Value Problem Statement We have given an array containing N number of elements. In the given array, Count the number of triplets with a sum less than the given value. Example Input a[] = {1, 2, 3, 4, 5, 6, 7, 8} Sum = 10 Output 7 Possible triplets are : ...

Question 5. Find Triplet in Array With a Given Sum Problem Statement Given an array of integers, find the combination of three elements in the array whose sum is equal to a given value X. Here we will print the first combination that we get. If there is no such combination then print -1. Example Input N=5, X=15 arr[] = ...

## DoorDash Graph Questions

Question 6. Max Area of Island Problem Description: Given a 2D matrix, the matrix has only 0(representing water)  and 1(representing land) as entries. An island in the matrix is formed by grouping all the adjacent 1’s connected 4-directionally(horizontal and vertical). Find the maximum area of the island in the matrix. Assume that all four edges of ...

## DoorDash Matrix Questions

Question 7. Max Area of Island Problem Description: Given a 2D matrix, the matrix has only 0(representing water)  and 1(representing land) as entries. An island in the matrix is formed by grouping all the adjacent 1’s connected 4-directionally(horizontal and vertical). Find the maximum area of the island in the matrix. Assume that all four edges of ...

## DoorDash Other Questions

Question 8. Next Permutation LeetCode Solution Problem Statement Next Permutation LeetCode Solution – A permutation of an array of integers is an arrangement of its members into a sequence or linear order. For example, for arr = [1,2,3], the following are considered permutations of arr: [1,2,3], [1,3,2], [3,1,2], [2,3,1]. The next permutation of an array of integers is the next lexicographically greater permutation of ...

Question 9. Swim in Rising Water LeetCode Solution Problem Statement: Swim in Rising Water LeetCode Solution : You are given an n x n integer matrix grid where each value grid[i][j] represents the elevation at that point (i, j). The rain starts to fall. At time t, the depth of the water everywhere is t. You can swim from a square to another 4-directionally adjacent square if ...

Question 10. Longest Common Subsequence LeetCode Solution Problem Statement Longest Common Subsequence LeetCode Solution – Given two strings text1 and text2, return the length of their longest common subsequence. If there is no common subsequence, return 0. A subsequence of a string is a new string generated from the original string with some characters (can be none) deleted without changing the relative order of the remaining ...

Question 11. Diagonal Traversal LeetCode Solution Problem Statement Diagonal Traversal LeetCode Solution – Given a 2D integer array nums, return all elements of nums in diagonal order as shown in the below images. Input: nums = [[1,2,3],[4,5,6],[7,8,9]] Output: [1,4,2,7,5,3,8,6,9] Explanation for Diagonal Traversal LeetCode Solution Key Idea The first row and the last column in this problem would serve ...

Question 12. Analyze User Website Visit Pattern LeetCode Solution Problem Statement Analyze User Website Visit Pattern LeetCode Solution – You are given two string arrays username and website and an integer array timestamp. All the given arrays are of the same length and the tuple [username[i], website[i], timestamp[i]] indicates that the user username[i] visited the website website[i] at time timestamp[i]. A pattern is a list of three websites (not necessarily distinct). For example, ["home", ...

Question 13. Design Browser History LeetCode Solution Problem Statement Design Browser History LeetCode Solution – You have a browser with one tab where you start on the homepage and you can visit another url, get back in the history number of steps or move forward in the history number of steps. Implement the BrowserHistory class: BrowserHistory(string homepage) Initializes the object with the homepage of the ...

Question 14. Evaluate Reverse Polish Notation LeetCode Solution Problem Statement Evaluate Reverse Polish Notation LeetCode Solution – Evaluate the value of an arithmetic expression in Reverse Polish Notation. Valid operators are +, -, *, and /. Each operand may be an integer or another expression. Note that the division between two integers should truncate toward zero. It is guaranteed that the given ...

Question 15. Largest Rectangle in Histogram LeetCode Solution Problem Statement Largest Rectangle in Histogram LeetCode Solution – Given an array of integers heights representing the histogram’s bar height where the width of each bar is 1, return the area of the largest rectangle in the histogram. Example Test Case 1: Input: heights = [2, 1, 5, 6, 2, 3] Output: 10 Explanation: ...

Question 16. Binary Tree Right Side View LeetCode Solution Problem Statement Binary Tree Right Side View LeetCode Solution – Given the root of a binary tree, imagine yourself standing on the right side of it, and return the values of the nodes you can see ordered from top to bottom. Example Test Case 1: Input: root = [1, 2, 3, null, 5, null, ...

Question 17. Koko Eating Bananas LeetCode Solution Problem Statement Koko Eating Bananas LeetCode Solution – 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. Koko can decide her bananas-per-hour eating speed of k. Each hour, she chooses some pile of bananas and eats k bananas from that pile. If ...

Question 18. Find Median from Data Stream LeetCode Solution Problem Statement Find Median from Data Stream LeetCode Solution – The median is the middle value in an ordered integer list. If the size of the list is even, there is no middle value and the median is the mean of the two middle values. For example, for arr = [2,3,4], the median ...

Question 19. Asteroid Collision LeetCode Solution Problem Statement Asteroid Collision LeetCode Solution – We are given an array asteroids of integers representing asteroids in a row. For each asteroid, the absolute value represents its size, and the sign represents its direction (positive meaning right, negative meaning left). Each asteroid moves at the same speed. Find out the state ...

Question 20. Diagonal Traverse LeetCode Solution Problem Statement Diagonal Traverse LeetCode Solution – Given an m x n matrix mat, return an array of all the elements of the array in a diagonal order. Input: mat = [[1,2,3],[4,5,6],[7,8,9]] Output: [1,2,4,7,5,3,6,8,9] Explanation Consider the indices of the diagonals of an NxM matrix. Let’s use a 4×4 matrix as an example: ...

Question 21. Longest Increasing Path in a Matrix LeetCode Solution Problem Statement Longest Increasing Path in a Matrix LeetCode Solution – Given an m x n integers matrix, return the length of the longest increasing path in matrix. From each cell, you can either move in four directions: left, right, up, or down. You may not move diagonally or move outside the boundary (i.e., wrap-around is not allowed). Input: ...

Question 22. Serialize and Deserialize Binary Tree LeetCode Solution Problem Statement Serialize and Deserialize Binary Tree LeetCode Solution – Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection link to be reconstructed later in ...

Question 23. Binary Tree Maximum Path Sum LeetCode Solution Problem Statement Binary Tree Maximum Path Sum LeetCode Solution – A path in a binary tree is a sequence of nodes where each pair of adjacent nodes in the sequence has an edge connecting them. A node can only appear in the sequence at most once. Note that the path does not need ...

Question 24. Minimum Knight Moves LeetCode Solution Problem Statement Minimum Knight Moves LeetCode Solution – In an infinite chessboard with coordinates from -infinity to +infinity, you have a knight at square [0, 0]. A knight has 8 possible moves it can make, as illustrated below. Each move is two squares in a cardinal direction, then one square in an orthogonal direction. Return the minimum number ...

Question 25. Employee Free Time LeetCode Solution Problem Statement Employee Free Time LeetCode Solution – We are given a list schedule of employees, which represents the working time for each employee. Each employee has a list of non-overlapping Intervals, and these intervals are in sorted order. Return the list of finite intervals representing the common, positive-length free time for all employees, also in ...

Question 26. Jump Game Leetcode Solution Problem Statement Jump Game Leetcode Solution – You are given an integer array nums. You are initially positioned at the array’s first index, and each element in the array represents your maximum jump length at that position. Return true if you can reach the last index, or false otherwise. Example: Input 1: nums = [2, ...

Question 27. Next Greater Element III LeetCode Solution Problem Statement The problem, Next Greater Element III LeetCode Solution states that you are given a positive integer n and you need to find the next greatest integer using the digits present in n only. If there does not exist any such integer, you need to print -1. Moreover, the new ...

Question 28. Number of Provinces Leetcode Solution Problem Statement Number of Provinces Leetcode Solution – We are given an adjacency matrix representation of a graph and need to find the number of provinces. Here province is a group of directly or indirectly connected cities and no other cities outside of the group. Example Example 1: Input: isConnected ...

Question 29. Sudoku Solver In the sudoku solver problem we have given a partially filled (9 x 9) sudoku, write a program to complete the puzzle. Sudoku must satisfy the following properties, Every number(1-9) must appear exactly once in a row and once in a column. Every number(1-9) must appear exactly once in a ...

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