Solving LeetCode 907 Sum of Subarray Minimums | Monotonic Stack | Amazon | Apple | Microsoft

LeetCode problem 907. Sum of Subarray Minimums [ 20 Jan 2024 ]

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📌 Video Overview:
Dive deep into the solution for the LeetCode challenge titled '907. Sum of Subarray Minimums'. Whether you're kickstarting your coding journey or aiming for roles at tech giants like Facebook, Amazon, Apple, Netflix, or Google, this tutorial is tailored for you. We'll break down the problem step-by-step, ensuring clarity and understanding.

🌟 Key Highlights:

A comprehensive walkthrough of the problem statement.
An intuitive explanation for both novice and intermediate coders.
Practical insights for acing interviews with top tech companies.
Code walkthrough to grasp the algorithmic approach.

📌 Chapters:
00:00 Problem Statement
01:27 Example
02:13 Approach 1
08:18 Approach 2 - Monotonic Stack
21:48 Code

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LeetCode Problem Statement:

Given an array of integers arr, find the sum of min(b), where b ranges over every (contiguous) subarray of arr. Since the answer may be large, return the answer modulo 109 + 7.



Example 1:

Input: arr = [3,1,2,4]
Output: 17
Explanation:
Subarrays are [3], [1], [2], [4], [3,1], [1,2], [2,4], [3,1,2], [1,2,4], [3,1,2,4].
Minimums are 3, 1, 2, 4, 1, 1, 2, 1, 1, 1.
Sum is 17.
Example 2:

Input: arr = [11,81,94,43,3]
Output: 444