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
Пікірлер: 5
Thank you for this but its actually quite hard a problem. I think maybe it should be reclassified as a hard.
@CodeHarmonyLab
6 ай бұрын
Yeah, the optimization is not each to crack!
Your code is not getting accepted on LC. Here's one test case that is failing [71,55,82,55]
We can use sliding window too right?
@CodeHarmonyLab
6 ай бұрын
We have to capture min among every contiguous subarray. yea, we can use a sliding window here but won't be able to get a better time solution using that, because we have to capture subarrays of every size here.