Sum of Subarray Minimums | Detailed | Leetcode 907

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This is the 4th Video of our Playlist "Stack : Popular Interview Problems".
In this video we will try to solve a very good and famous stack problem - Sum of Subarray Minimums (Leetcode 907)

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 : Sum of Subarray Minimums (Leetcode 907)
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My solutions on Github(C++ & JAVA) : https://github.com/MAZHARMIK/Intervie...
Leetcode Link : https://leetcode.com/problems/sum-of-...


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Approach Summary : The approach involves finding the next smaller element to the left (NSL) and the next smaller element to the right (NSR) for each element in the array. It utilizes a stack-based approach to efficiently compute these values.
The algorithm then iterates through each element of the array, calculating the distance to the nearest smaller element on the left (d1) and the distance to the nearest smaller element on the right (d2). For each element, it determines the total number of ways to form subarrays with that element as the minimum by multiplying d1 and d2. The sum of the minimum elements for each subarray is accumulated, and the result is returned after taking the modulo operation with 1e9 + 7.
The code leverages the concept of finding the next smaller element to efficiently compute the sum of minimum elements for all possible subarrays in a given array.

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✨ Timelines✨
00:00 - Introduction

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