April 2025 - Cs Maven

Fixing “Required Request Body is Missing” in Spring Boot: A Complete Guide

By admin April 14, 2025

Meta Description: Running into the "Required request body is missing" error in Spring Boot? Learn what causes it and how to fix it using @RequestBody, @RequestParam, and proper content headers.…

Fixing GitLab CI Integration Tests for Spring Boot with PostgreSQL in Docker

By admin April 10, 2025

❌ The Problem You’ve got a Spring Boot application using PostgreSQL in Docker. Everything works locally, but in GitLab CI, integration tests fail with: Connection refused: Cannot connect to PostgreSQL…

Fixing “Cannot Resolve Symbol” in IntelliJ Even When Code Compiles

By admin April 10, 2025

One of the most frustrating issues developers encounter in IntelliJ IDEA is the "Cannot resolve symbol" error—especially when the code compiles and runs just fine. If you've seen red underlines…

LeetCode Problem 98: Validate Binary Search Tree(BST) Solution in C++, Java, Python

By admin April 10, 2025

🔍 Problem Overview You’re given the root of a binary tree—your task is to determine whether it’s a valid Binary Search Tree (BST). BST Definition: Left subtree nodes < current…

LeetCode Problem 91: Decode Ways

By admin April 10, 2025

The Decode Ways problem (LeetCode #91) challenges us to determine the number of ways an encoded message, represented as a string of digits, can be decoded into letters using the…

LeetCode 79: Word Search – DFS Solution Explained (C++, Java, Python, C#)

By admin April 10, 2025

Solve LeetCode's Word Search problem efficiently using Depth-First Search (DFS) with backtracking. This comprehensive guide provides optimized code implementations in four languages, complexity analysis, and a step-by-step breakdown of the…

LeetCode 76: Minimum Window Substring – Sliding Window Solution in C++, Java, Python & C#

By admin April 10, 2025

What Is the Minimum Window Substring? The Minimum Window Substring problem asks: Given two strings s and t, find the smallest substring of s that contains all characters of t…

LeetCode 73: Set Matrix Zeroes – In-Place Solution (C++, Java, Python, C#)

By admin April 10, 2025

Keywords: In-place matrix algorithm, O(1) space complexity, matrix row and column update, LeetCode walkthrough, zeroing matrix, C++, Java, Python, C# solutions Problem Summary Given an m x n matrix, if…

LeetCode 2129: Capitalize the Title – Explained with Code in C++, Java, Python & C#

By admin April 8, 2025

If you're tackling string manipulation problems on LeetCode, Problem 2129: Capitalize the Title is a great one to master. It challenges your understanding of word boundaries, character casing, and clean…

LeetCode Problem 70: Climbing Stairs

By admin April 8, 2025

Climbing Stairs Made Easy: A Dynamic Programming Solution If you're diving into coding interviews or sharpening your algorithmic skills, LeetCode Problem 70: Climbing Stairs is a staple you can't ignore.…

LeetCode Problem 62: Unique Paths Mastering the Unique Paths Problem with Dynamic Programming:

By admin April 8, 2025

A Complete Guide Whether you're prepping for coding interviews or honing your algorithmic thinking, LeetCode Problem 62: Unique Paths is a must-know dynamic programming (DP) challenge. In this step-by-step guide,…

LeetCode 57: Insert Interval – Java Solution & Intuitive Guide

By admin April 7, 2025

Having trouble with LeetCode 57: Insert Interval? This detailed walkthrough shows you how to insert and merge a new interval into a sorted list of non-overlapping intervals. With a clear…