PayPal SDE-2 Interview Questions, Process, and Tips

Had questions on graph

Q1. Binary Search leftmost rightmost
Add your answer

Q1. Monotonic stack question
Add your answer

Q1. System design round, discussed subscriber publisher design pattern
Add your answer

Round duration - 90 minutes
Round difficulty - Easy

There will be 2 coding questions easy to medium based on DP and linkedlist.

Q1. 
Count Ways To Reach The N-th Stair Problem Statement
You are given a number of stairs, N. Starting at the 0th stair, you need to reach the Nth stair. Each time you can either climb one step or two steps. ...read more
Add your answer

Round duration - 60 minutes
Round difficulty - Easy

the questions will be be based on trees, linked list and stacks and queues, DP

Q1. 
Left View of a Binary Tree
Given a binary tree, your task is to print the left view of the tree. The left view of a binary tree contains the nodes visible when the tree is viewed from the left side.
Inpu...read more
Add your answer
Q2. 
Next Greater Element Problem Statement
You are given an array arr of length N. For each element in the array, find the next greater element (NGE) that appears to the right. If there is no such greater ele...read more
Add your answer

Round duration - 60 minutes
Round difficulty - Medium

(DSA, work experience and personal projects)

Q1. 
Problem: Sort an Array of 0s, 1s, and 2s
Given an array/list ARR consisting of integers where each element is either 0, 1, or 2, your task is to sort this array in increasing order.
Input:
The input sta...read more
Add your answer

Round duration - 60 minutes
Round difficulty - Medium

It started in the afternoon after the lunch.

Q1. You will be given certain conditions for which you need to design a system. Can you explain your approach to low-level system design?
Add your answer

Round duration - 25 minutes
Round difficulty - Easy

Once all the rounds were cleared. I was told that i have 1 more round with manager.

Q1. How do you handle critical situations in a workplace?
Add your answer

Round duration - 75 minutes
Round difficulty - Medium

There were 2 coding questions. One was easy to medium difficult and other was of medium difficulty.

Q1. 
Sum Queries in a Sorted Array
Given two arrays arr and queries, your task is to determine the sum of all elements in arr that are less than or equal to each element in queries. The array arr is provided i...read more
Add your answer
Q2. 
Find K Closest Elements
Given a sorted array 'A' of length 'N', and two integers 'K' and 'X', your task is to find 'K' integers from the array closest to 'X'. If two integers are at the same distance, pre...read more
Add your answer

Round duration - 60 Minutes
Round difficulty - Easy

Q1. 
Reverse Only Letters Problem Statement
You are given a string S. The task is to reverse the letters of the string while keeping non-alphabet characters in their original position.
Example:
Input:
S = "...read more
Add your answer
Q2. 
Find The Sum Of The Left Leaves Problem Statement
Given a binary tree with ‘root’, your task is to find and return the sum of all the left leaf nodes.
Example:
Input:
1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1...read more
Add your answer

Round duration - 60 Minutes
Round difficulty - Easy

Questions related to Java, OOPs, SQL etc. 

Round duration - 60 Minutes
Round difficulty - Easy

It was an HR round.Questions related to resume, Low level design, work experience, behavioural etc. This round stretched more than scheduled time so another round was scheduled which was again a DSA based technical round.

Round duration - 60 Minutes
Round difficulty - Medium

This round had 3 problems. easy, medium and hard.

Q1. 
Median of Two Sorted Arrays
Given two sorted arrays A and B of sizes N and M, find the median of the merged array formed by combining arrays A and B. If the total number of elements, N + M, is even, the m...read more
Add your answer
Q2. 
Palindrome Checker Problem Statement
Given an alphabetical string S, determine whether it is a palindrome or not. A palindrome is a string that reads the same backward as forward.
Input:
The first line ...read more
Add your answer
Q3. 
Minimum Character Deletion Problem Statement
You have been provided a string STR. Your task is to find and return the minimum number of characters that need to be deleted from STR so that each character's...read more
Add your answer

Round duration - 50 minutes
Round difficulty - Easy

Problem-solving round in javascript.
Asked me questions of easy to medium level data structures and algorithm.

Q1. 
Similar String Groups Problem Statement
Two strings S1 and S2 are considered similar if either S1 equals S2 or we can swap two letters of S1 at different positions so that it equals S2.
Input:
The first...read more
Ans. Graph(I)
Consider that each string in ‘STRS’ represents a node in the graph, and there is an undirected edge between two nodes if strings represented by them are similar. After that, the problem reduces to finding the number of connected components in a graph, which can be solved either by Depth First Search or Breadth-First Search. 
 
A naive algorithm based on Depth First Search (DFS), in which for each string...read more
Answered Anonymously
Add your answer

Round duration - 50 minutes
Round difficulty - Medium

Javascrip specific questions

Round duration - 50 minutes
Round difficulty - Easy

Focussed on behavioural aptitude