Problem Solving Repository

Personal collection of self-solved programming challenges from platforms such as LeetCode, Codeforces, HackerRank, and Project Euler. Focus areas include data structures, algorithms, and problem-solving practice across various topics.

Structure

• src/main/java/henrro/problemsolving/leetcode - Java solutions for LeetCode.
• src/main/java/henrro/problemsolving/codeforces - Java and C++ solutions for Codeforces.
• src/main/java/henrro/problemsolving/hackerrank - Java solutions for HackerRank.

File naming follows Problem<id>.<ext> (e.g., Problem242.java, Problem160A.cpp).

Tech

• Java, C++
• Maven
• macOS
• IDE: IntelliJ IDEA

Run examples

Using IntelliJ IDEA:

• Open the project and run any file with a main method directly from the editor.

Terminal - Java:

• Compile and run a single file:
  • javac -d out src/main/java/henrro/problemsolving/leetcode/Problem242.java
  • java -cp out henrro.problemsolving.leetcode.Problem242

Terminal - C++:

• clang++ -std=c++17 -O2 src/main/java/henrro/problemsolving/codeforces/Problem160A.cpp -o run && ./run

Topics practiced

• Arrays, strings, hash maps, sorting
• Two pointers, greedy, prefix sums
• Binary search, stacks, queues
• Trees, graphs, DFS/BFS
• Dynamic programming, bit manipulation

Notes

• Each solution is self-contained and optimized progressively over time.
• This repository serves as a learning log and reference for revisiting concepts and patterns.