In this video, we solve LeetCode 2784: Check if Array is Good with an easy and beginner-friendly explanation in C++.
We will understand:
✅ Problem Explanation
✅ What is a “Good Array”
✅ Sorting Based Approach
✅ Frequency Count Logic
✅ Step-by-Step Dry Run
✅ Time & Space Complexity
✅ Interview Tips
🔥 Topics Covered:
Arrays
Sorting
Frequency Counting
Hash Map
Basic Math Logic
Easy Interview Problems
💡 Problem Idea:
An array is considered “good” if:
It contains numbers from:
1 to n-1
exactly once
AND
The largest number:
n-1
appears exactly twice.
Example:
Input:
[2,1,3]
Output:
false
Input:
[1,3,3,2]
Output:
true
📌 Approaches Explained:
Sorting Approach
Frequency Count Method
💻 Language Used:
C++
📌 Problem Link:
LeetCode 2784 - Check if Array is Good
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