LeetCode 1456: Maximum Number of Vowels in a Substring of Given Length (ACERS Guide)

Subtitle / Summary A standard fixed-window counting problem. This ACERS guide explains the sliding-window model, engineering use cases, and runnable multi-language solutions. Reading time: 10–12 min Tags: sliding window, string, fixed window SEO keywords: Maximum Number of Vowels, Sliding Window, Fixed Window Meta description: Fixed-window sliding count for maximum vowels with engineering applications. A — Algorithm Problem Restatement Given a string s and an integer k, return the maximum number of vowels in any substring of length k. ...

January 20, 2026 · 7 min · map[name:Jeanphilo]

LeetCode 239: Sliding Window Maximum (Monotonic Queue ACERS Guide)

Title LeetCode 239: Sliding Window Maximum (Monotonic Queue ACERS Guide) Subtitle / Summary Sliding Window Maximum is the classic combo of sliding window + monotonic queue. This article follows the ACERS template with reusable engineering patterns and multi-language implementations. Estimated reading time: 12–15 minutes Tags: sliding window, monotonic queue, array SEO keywords: Sliding Window Maximum, monotonic queue, deque, O(n) Meta description: Monotonic-queue solution for Sliding Window Maximum with engineering practice and multi-language implementations. A — Algorithm (Problem & Algorithm) Problem Restatement Given an integer array nums and a window size k, a sliding window moves from left to right. Each move shifts the window by one. Return the maximum for each window. ...

January 19, 2026 · 8 min · map[name:Jeanphilo]