Longest Strictly Increasing or Strictly Decreasing Subarray | Leetcode 3105 | codestorywithMIK
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Hi Everyone, this is the 66th video of our Playlist "Leetcode Easy".
Now we will be solving an easy practice problem on Array - Longest Strictly Increasing or Strictly Decreasing Subarray | 2 Approaches | Leetcode 3105 | codestorywithMIK
We will solve it from Brute Force to Optimal
Problem Name : Longest Strictly Increasing or Strictly Decreasing Subarray | 2 Approaches | Leetcode 3105 | codestorywithMIK
Company Tags : will update later
My solutions on Github(C++ & JAVA) - https://github.com/MAZHARMIK/Interview_DS_Algo/blob/master/Arrays/Leetcode Easy/Longest Strictly Increasing or Strictly Decreasing Subarray.cpp
Leetcode Link : https://leetcode.com/problems/longest-strictly-increasing-or-strictly-decreasing-subarray
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Video Summary :
Approach 1: Brute Force
Intuition: For each element, check both increasing and decreasing subarrays starting from that point.
Thought Process: Iterate through the array, and for every index, expand to the right as long as the sequence is strictly increasing or decreasing. Track the maximum length found.
Approach 2: Optimal
Intuition: Instead of restarting from every element, continue tracking the current increasing or decreasing sequence in a single pass.
Thought Process: Use two counters—one for increasing and one for decreasing sequences. Reset the opposite counter whenever the trend breaks. Continuously update the maximum length as you traverse the array.
✨ Timelines ✨
00:00 - Introduction
00:19 - Motivation
00:37 - Problem Explanation
02:18 - Approach-1 (Brute Force)
06:19 - Approach-3 (Optimal)
12:20 - Coding it up
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