Recently I appeared for the Zopsmart Online Assessment.
Unfortunately, I was rejected, but sharing the questions for learning and future reference.

Round 1 (45 Minutes | 2 Questions)

Q1: Base Conversion + Integer Square Root

• Convert a decimal number to hex
• Treat hex as base 36
• Convert to decimal
• Return floor(sqrt(value))

Example
Input: 100
Hex → 64
Base36 → 220
Output → 14

Q2: Reverse Base-36 Number

• Convert decimal to base 36
• Reverse the string
• Treat it again as base 36
• Convert to decimal

Example
100 → 2S → S2 → 1010

Round 2 (30 Minutes | 1 Question)

Q1 Hidden Roman Numeral

• Extract only Roman letters (I, V, X, L, C, D, M)
• Combine adjacent letters only if value reduces
• Order must remain same
• Find minimum total value

Example
Input: I HAVE EATEN
Extracted: IV
Output: 4

Result

Rejected

Round 3 (Linked List Question Pan Paper Test)

Q1 Reverse Linked List in Increasing Groups (Odd Pattern)
Problem Statement (Simplified)
Given a singly linked list, reverse the nodes in increasing group sizes:

• First group → size 1 (no change)
• Second group → size 2 (no change)
• Third group → size 3 → reverse
• Fourth group → size 4 → reverse
• Group size increases by 1 each time

Example
Input:
1 → 2 → 3 → 4 → 5 → 6

Processing:
Group 1 (1): 1
Group 2 (2): 2 → 3
Group 3 (3): 4 → 5 → 6 (reverse)

Output:
1 → 2 → 3 → 6 → 5 → 4

Note: This Round 3 experience was shared by my friend.