Minimum Number of Operations to Make Array Empty | Explained with Reasons | Greedy | Leetcode 2870
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This is the 24th Video of our Playlist "Greedy Technique : Popular Interview Problems".
In this video we will try to solve a good Greedy problem - Minimum Number of Operations to Make Array Empty (Leetcode - 2870)
I will explain the intuition so easily that you will never forget and start seeing this as cakewalk EASYYY.
We will do live coding after explanation and see if we are able to pass all the test cases.
Also, please note that my Github solution link below contains both C++ as well as JAVA code.
Problem Name : Minimum Number of Operations to Make Array Empty
Company Tags : will update soon
My solutions on Github(C++ & JAVA) : https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Greedy/Minimum%20Number%20of%20Operations%20to%20Make%20Array%20Empty.cpp
Leetcode Link : https://leetcode.com/problems/minimum-number-of-operations-to-make-array-empty/
My DP Concepts Playlist : https://youtu.be/7eLMOE1jnls
My Graph Concepts Playlist : https://youtu.be/5JGiZnr6B5w
My GitHub Repo for interview preparation : https://github.com/MAZHARMIK/Interview_DS_Algo
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Approach Summary : The approach involves creating an unordered map (mp) to store the frequency of each element in the vector. Then, it iterates through the map and calculates the operations required for each unique element based on its frequency. If any element has a frequency of 1, indicating it cannot be paired for equality, the function returns -1. Otherwise, it returns the total number of operations needed to equalize the elements. The operations involve removing elements in groups of three, and the frequency of each element determines the number of such groups.
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✨ Timelines✨
00:00 - Introduction
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