Amazon Software Development Engineer 1 Interview Questions and Answers

Design a system for making table reservations at a restaurant.

• Create a user-friendly interface for customers to make reservations

• Allow customers to select date, time, and party size

• Provide real-time updates on table availability

• Integrate with the restaurant's seating chart and reservation system

• Send confirmation emails or texts to customers

• Allow customers to modify or cancel reservations

• Provide analytics for the restaurant to track reservations and customer behavior

Count the number of islands in a 2D grid of 1s and 0s.

• An island is a group of connected 1s (horizontally or vertically).

• Use DFS or BFS to traverse the grid and mark visited cells.

• Count the number of times you start a traversal from an unvisited 1.

Remove duplicates from a list

• Create a new empty list

• Loop through the original list

• If an element is not in the new list, add it

• Return the new list

The code I wrote is a function that sorts an array of integers in ascending order using bubble sort algorithm.

• The code starts by iterating through the array and comparing adjacent elements, swapping them if they are in the wrong order.

• This process is repeated until no more swaps are needed, indicating that the array is sorted.

• The time complexity of bubble sort is O(n^2) in the worst case scenario.

• Example: int[] arr = {5, 2, 9, 1, 5}; After sorting: {1, 2, 5, 5, 9}

Find maximum number of intersections in a given time range.

• Consider all the intervals and their start and end times.

• Sort the intervals based on their start times.

• Use a priority queue to keep track of the intervals that are currently active.

• Update the maximum number of intersections whenever a new interval is added or removed from the priority queue.