Minimum Recolors to Get K Consecutive Black Blocks | 2 Approaches | Leetcode 2379 | codestorywithMIK
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Hi Everyone, this is the 73rd video of our Playlist "Leetcode Easy : Popular Interview Problems".
Now we will be solving a good practice Sliding Window problem - Minimum Recolors to Get K Consecutive Black Blocks | 2 Detailed Approaches | Leetcode 2379 | codestorywithMIK
We will solve it using 2 Approaches : Brute Force and then Sliding Window using Khandani Template
Problem Name : Minimum Recolors to Get K Consecutive Black Blocks | 2 Detailed Approaches | Leetcode 2379 | codestorywithMIK
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My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Sliding Window/Leetcode Easy/Minimum Recolors to Get K Consecutive Black Blocks.cpp
Leetcode Link : https://leetcode.com/problems/minimum-recolors-to-get-k-consecutive-black-blocks
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Video Summary :
Approach-1 (Brute Force):
This approach checks every possible contiguous subarray of length k and counts the number of 'W' characters in each. The minimum number of recolors needed is updated as we iterate through all possible subarrays.
Approach-2 (Sliding Window):
Instead of recalculating for every subarray, this approach maintains a sliding window of size k, efficiently updating the count of 'W' as the window moves. This helps in reducing redundant computations and speeds up the process.
✨ Timelines✨
00:00 - Introduction
0:42 - Motivation
1:07 - Problem Explanation
3:19 - Thought Process (Brute Force)
7:30 - Coding Brute Force
9:54 - Brute Force Time & Space Complexity
10:10 - Optimal Approach
11:30 - Dry Run of Optimal Approach
16:54 - Optimal Time & Space Complexity
17:10 - Coding Optimal Approach
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