Count Number of Bad Pairs | 3 Ways | Intuition | Leetcode 2364 | codestorywithMIK
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Hi Everyone, this is the 16th video of our Playlist "Hash Map/Set : Popular Interview Problems".
Now we will be solving a good practice problem on HashMap - Count Number of Bad Pairs | 3 Ways | Intuition | Leetcode 2364 | codestorywithMIK
We will solve it using 3 ways and will focus on thought process and intuition
Problem Name : Count Number of Bad Pairs | 3 Ways | Intuition | Leetcode 2364 | codestorywithMIK
Company Tags : will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/HashMap/Count Number of Bad Pairs.cpp
Leetcode Link : https://leetcode.com/problems/count-number-of-bad-pairs/description/
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Video Summary :
Transforming the Array:
Modify nums[i] to nums[i] - i so that the problem reduces to finding equal values instead of explicitly checking pair conditions.
This transformation helps identify "good pairs" efficiently.
Using a HashMap for Frequency Counting:
Maintain a frequency map to track occurrences of transformed values.
If a value has appeared before, it contributes to "good pairs," reducing the need for brute force comparison.
Calculating Bad Pairs Efficiently:
Instead of iterating over all pairs, compute the total possible pairs (j, i) implicitly.
Use the count of previously seen values to determine how many pairs are "good," and subtract from the total to get "bad pairs."
✨ Timelines ✨
00:00 - Introduction
00:20 - Motivation
01:04 - Problem Explanation
02:48 - Approach-1 (Brute Force)
04:20 - Approach-2 (Optimal)
18:43: - Coding Approach-2
21:46 - Approach-3 (Optimal)
26:39 - Coding Approach-3
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