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Paypal Placement Papers 2024

Overview

This page collects PayPal placement papers from 2024 with previous-year questions, solutions, and the 2024 exam pattern. It is useful when you want real drive history: what the OA looked like, which question types repeated, and how solutions were approached. Work through the papers below to build speed and accuracy, then compare against newer 2025 material so your prep matches both established PayPal patterns and the latest shifts.

Paypal Online Assessment 2024 pattern

Section Questions Time Difficulty
Coding Problems 2-3 90 min Medium-Hard

Paypal Placement Papers 2024 - actual questions & solutions

This section contains practice questions styled on PayPal placement papers 2024 (previous-year pattern), with worked solutions. Use them as timed sectional drills - from student reports drives vary by college and role, so treat this as a high-signal practice bank, not an official paper dump.

Question 1: two sum

Show solution

Problem Statement: Given an array of integers and a target, return indices of two numbers that add up to target.

Example:

Input: nums = [2, 7, 11, 15], target = 9
Output: [0, 1]

Solution (Java):

public int[] twoSum(int[] nums, int target) {
    Map<Integer, Integer> map = new HashMap<>();
    for (int i = 0; i < nums.length; i++) {
        int need = target - nums[i];
        if (map.containsKey(need)) return new int[]{map.get(need), i};
        map.put(nums[i], i);
    }
    return new int[]{};
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 2: detect cycle in linked list

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Problem Statement: Return true if the linked list has a cycle.

Example:

Input: 3→2→0→-4→(back to 2)
Output: true

Solution (Java):

public boolean hasCycle(ListNode head) {
    ListNode slow = head, fast = head;
    while (fast != null && fast.next != null) {
        slow = slow.next;
        fast = fast.next.next;
        if (slow == fast) return true;
    }
    return false;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 3: reverse a string

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Problem Statement: Given a string, return it reversed.

Example:

Input: "placement"
Output: "tnemecalp"

Solution (Java):

public String reverse(String s) {
    return new StringBuilder(s).reverse().toString();
}

Time Complexity: O(n)
Space Complexity: O(n)

Question 4: check palindrome

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Problem Statement: Return true if the string reads the same forward and backward (ignore case).

Example:

Input: "Level"
Output: true

Solution (Java):

public boolean isPalindrome(String s) {
    s = s.toLowerCase();
    int i = 0, j = s.length() - 1;
    while (i < j) {
        if (s.charAt(i++) != s.charAt(j--)) return false;
    }
    return true;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 5: climbing stairs

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Problem Statement: You can climb 1 or 2 steps. How many distinct ways to climb n stairs?

Example:

Input: n = 4
Output: 5

Solution (Java):

public int climbStairs(int n) {
    if (n <= 2) return n;
    int a = 1, b = 2;
    for (int i = 3; i <= n; i++) {
        int c = a + b; a = b; b = c;
    }
    return b;
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 6: rotate array right by k

Show solution

Problem Statement: Rotate the array to the right by k steps.

Example:

Input: [1,2,3,4,5,6,7], k = 3
Output: [5,6,7,1,2,3,4]

Solution (Java):

public void rotate(int[] nums, int k) {
    k %= nums.length;
    reverse(nums, 0, nums.length - 1);
    reverse(nums, 0, k - 1);
    reverse(nums, k, nums.length - 1);
}
void reverse(int[] a, int l, int r) {
    while (l < r) { int t = a[l]; a[l++] = a[r]; a[r--] = t; }
}

Time Complexity: O(n)
Space Complexity: O(1)

Question 7: merge two sorted lists

Show solution

Problem Statement: Merge two sorted linked lists and return a new sorted list.

Example:

Input: 1→2→4 , 1→3→4
Output: 1→1→2→3→4→4

Solution (Java):

public ListNode mergeTwoLists(ListNode a, ListNode b) {
    ListNode dummy = new ListNode(0), cur = dummy;
    while (a != null && b != null) {
        if (a.val <= b.val) { cur.next = a; a = a.next; }
        else { cur.next = b; b = b.next; }
        cur = cur.next;
    }
    cur.next = (a != null) ? a : b;
    return dummy.next;
}

Time Complexity: O(n + m)
Space Complexity: O(1)

Question 8

Q8: Virtual memory is typically implemented using?

Solution:

OS uses demand paging (and sometimes segmentation) to implement virtual memory.

Answer: Demand paging

Question 9

Q9: In OOP, hiding internal details and showing only essential features is called?

Solution:

This is the definition of Encapsulation (often paired with abstraction in interviews).

Answer: Encapsulation

Question 10

Q10: Which data structure uses FIFO order?

Solution:

FIFO = First In First Out → Queue. Stack is LIFO.

Answer: Queue

Question 11

Q11: Time complexity of binary search on a sorted array of n elements is?

Solution:

Each step halves the search space → O(log n).

Answer: O(log n)

Key insights from 2024 Paypal Online Assessment

  1. Coding Section is Critical: Must solve 2-3 coding problems correctly to advance
  2. Payment System Focus: Strong emphasis on payment systems, transaction processing, security
  3. Time Management: 2-3 problems in 90 minutes requires excellent speed and accuracy
  4. Success Rate: Only 10-15% cleared OA and advanced to interviews
  5. Platform: PayPal’s assessment platform or HackerRank
  6. Focus Areas: Arrays, trees, graphs, dynamic programming, payment systems, transaction processing

Paypal 2024 interview experiences

Based on candidate experiences from 2024 PayPal interviews:

2024 Interview Process:

  1. Online Assessment (90 minutes): 2-3 coding problems
  2. Technical Phone Screen (45-60 minutes): Coding problems, algorithm discussions, payment system concepts
  3. Onsite Interviews (4-5 rounds, 45-60 minutes each):
  • Coding rounds (2-3): Algorithms, data structures, problem-solving
  • System Design rounds: Payment systems, transaction processing, fraud detection, security systems
  • Behavioral rounds: Problem-solving approach, security mindset, impact

Common 2024 Interview Topics:

  • Coding: Arrays, strings, trees, graphs, dynamic programming, payment algorithms
  • System Design: Payment systems, transaction processing, fraud detection, security systems
  • Behavioral: Problem-solving, security mindset, teamwork, impact
  • PayPal Technologies: Payment systems, transaction processing, fraud detection, security

2024 Interview Questions Examples:

  • Payment Transaction Validation
  • Design PayPal’s payment processing system (System Design)
  • Design PayPal’s fraud detection system (System Design)
  • Security-related coding problems

Success Tips:

  • Strong coding performance is essential - solve problems optimally
  • Understand payment systems and transaction processing concepts
  • Practice system design for payment systems and security
  • Prepare examples demonstrating problem-solving and security mindset
  • Learn PayPal’s products and payment technologies
  • Practice explaining your thought process clearly

For detailed interview experiences, visit PayPal Interview Experience page.

Preparation tips for Paypal 2024 pattern

  1. Master Coding Fundamentals: Focus on solving 2-3 coding problems correctly - arrays, trees, graphs, DP
  2. Payment System Knowledge: Strong understanding of payment systems, transaction processing, security
  3. Practice Previous Year Papers: Solve PayPal OA papers from 2020-2024 to understand patterns
  4. Time Management: Practice completing 2-3 coding problems in 90 minutes
  5. LeetCode Practice: Solve 200+ LeetCode problems focusing on arrays, strings, trees, graphs (medium-hard difficulty)
  6. Fintech Focus: Practice problems related to payment systems and transactions
  7. System Design Mastery: Learn payment system design, transaction processing, fraud detection, security
  8. Security Knowledge: Understand security best practices for payment systems
  9. Behavioral Preparation: Prepare examples using STAR format - problem-solving, security mindset, impact
  10. Mock Tests: Take timed practice tests to improve speed and accuracy

Comments & Suggestions

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