First Non-Repeating Element in Array | TCS DSA Question | Placement Prep
Автор: Let’s Crack It
Загружено: 2026-01-05
Просмотров: 86
In this video, we solve an important TCS DSA coding question:
Find the First Non-Repeating Element in a given array.
This question is frequently asked in:
✔ TCS NQT
✔ Campus Placements
✔ Coding Interviews
📌 Problem Statement:
Given an array of integers, find the first element that does not repeat.
Example:
Input: {-1, 2, -1, 3, 0}
Output: 2
📌 Approach Used:
Frequency counting using Hash Map
Preserving original order of elements
Time Complexity: O(n)
Space Complexity: O(n)
📌 This video is useful for:
✔ TCS NQT preparation
✔ DSA for beginners
✔ Placement coding practice
✔ Freshers preparing for interviews
🔔 Subscribe to Let’s Crack Placements for regular DSA and placement preparation videos.
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