82. Linear Search in Array

You are given an array of n unsigned 8-bit integers (uint8_t) and a key. Your task is to:

• Search for the key
• Print the index of its first occurrence
• If not found, print -1

Do not use standard library functions. Use only loop and index logic.

Example-1

Input: n = 5, arr = [10 20 30 40 50], key = 30
Output: 2

Example-2

Input: n = 4, arr = [5 8 12 9], key = 7
Output: -1

Example-3

Input: n = 6, arr = [1 1 2 3 1 4], key = 1
Output: 0