Count Elements With Maximum Frequency | One Pass | Two Pass | Leetcode 3005

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Published on March 8, 2024 5:57:11 AM ● Video Link: https://www.youtube.com/watch?v=zQUiPN0grwA

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Frequency (2001)

Duration: 12:50

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This is the 25th Video of our Playlist "Leetcode Easy : Popular Interview Problems".
In this video we will try to solve a very good practice and a potential interview problem : Count Elements With Maximum Frequency | One Pass | Two Pass | Leetcode 3005

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Problem Name : Count Elements With Maximum Frequency | One Pass | Two Pass | Leetcode 3005
Company Tags : will update soon
My solutions on Github(C++ & JAVA) : https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Arrays/Leetcode%20Easy/Count%20Elements%20With%20Maximum%20Frequency.cpp
Leetcode Link : https://leetcode.com/problems/count-elements-with-maximum-frequency/


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Approach Summary :
Approach-1 (Using 2 Pass):
- Time Complexity (T.C): O(n) - The algorithm iterates through the input vector once, and the count operation takes linear time in the size of the array.
- Space Complexity (S.C): O(1) - The space used is constant (101 integers) and does not depend on the size of the input vector. It is considered an in-place algorithm.
Summary: This approach involves two passes through the input vector. In the first pass, it counts the frequency of each element and determines the maximum frequency. In the second pass, it counts the occurrences of elements with the maximum frequency and returns the product of the count and the maximum frequency.

Approach-2 (Using 1 Pass):
- Time Complexity (T.C): O(n) - The algorithm iterates through the input vector once.
- Space Complexity (S.C): O(1) - Similar to the first approach, the space used is constant (101 integers), making it an in-place algorithm.
Summary: This approach optimizes the algorithm by performing the required calculations in a single pass through the input vector. It maintains both the maximum frequency (`maxFreq`) and the total count of elements with the maximum frequency (`total`). The result is the total count of elements with the maximum frequency.

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✨ Timelines✨
00:00 - Introduction
01:54 - Approach-1
4:46 - Approach-2
08:29 - Coding it up

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