Partition Array According to Given Pivot | Multiple Approaches | Leetcode 2161 | codestorywithMIK
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Hi Everyone, this is the 145th video of our Playlist "Arrays 1D/2D : Popular Interview Problems".
Now we will be solving a good array problem - Partition Array According to Given Pivot | Multiple Approaches | Leetcode 2161 | codestorywithMIK
We will do dry runs as well for each approach for better understanding and visualizing.
Problem Name : Partition Array According to Given Pivot | Multiple Approaches | Leetcode 2161 | codestorywithMIK
Company Tags : will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Arrays/Partition Array According to Given Pivot.cpp
Leetcode Link : https://leetcode.com/problems/partition-array-according-to-given-pivot
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Video Summary :
Approach 1 (Using Extra Space): The idea is to divide elements into three separate lists based on their relation to the pivot—less than, equal to, and greater than. Then, concatenate them to form the final result.
Approach 2 (Using Pointers Only): Instead of using separate lists, count the occurrences of elements less than and equal to the pivot to determine their positions. Then, place them directly in the result array while iterating through nums.
Approach 3 (Two-Pointer Approach): Utilize two pointers—one moving from the left to collect smaller values and another from the right to collect larger values. Finally, fill the remaining middle section with the pivot.
✨ Timelines✨
00:00 - Introduction
0:23 - Motivation
1:11 - Problem Explanation
2:52 - Thought Process Approach-1
7:13 - Thought Process Approach-2
16:40 - Coding Approach-1 & Approach-2
21:43 - Approach-3
27:25 - Coding Approach-3
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