--- title: "#codeforces articles | Hashnode" description: "Explore 74 articles tagged #codeforces on Hashnode. Tutorials, guides, and how-tos from the community." url: "https://hashnode.com/tag/codeforces" --- Tag # #codeforces 74 posts · 23 followers [Annet](https://hashnode.com/@annet-) · [Jul 18](https://hashnode.com/posts/codeforces-journey-3-learning-arrays-through-beginner-friendly-problems/6a5b911087520145e5792807) ### [Codeforces Journey #3: Learning Arrays Through Beginner-Friendly Problems](https://html-portfolio.hashnode.dev/codeforces-journey-3-learning-arrays-through-beginner-friendly-problems?utm_source=hashnode&utm_medium=feed) Follow my Codeforces learning journey as I solve beginner-friendly array problems in Python, covering array traversal, sorting, sets, reverse mapping, and problem-solving techniques. 5 min read · [html-portfolio.hashnode.dev](https://html-portfolio.hashnode.dev/codeforces-journey-3-learning-arrays-through-beginner-friendly-problems?utm_source=hashnode&utm_medium=feed) [Annet](https://hashnode.com/@annet-) · [Jul 6](https://hashnode.com/posts/solving-my-next-10-codeforces-problems-codeforces-journey-2/6a4b4d4298500c187b748486) ### [🧠 Solving My Next 10 Codeforces Problems | Codeforces Journey #2](https://html-portfolio.hashnode.dev/solving-my-next-10-codeforces-problems-codeforces-journey-2?utm_source=hashnode&utm_medium=feed) In this blog, I share my journey of solving my next 10 beginner-friendly Codeforces problems using Python. Learn the logic, approach, concepts used, solution code, and key takeaways from problems like Beautiful Year, Elephant, Soldier and Bananas, Presents, Anton and Danik, and more. This article is perfect for beginners starting competitive programming and improving problem-solving skills. 8 min read · [html-portfolio.hashnode.dev](https://html-portfolio.hashnode.dev/solving-my-next-10-codeforces-problems-codeforces-journey-2?utm_source=hashnode&utm_medium=feed) [Annet](https://hashnode.com/@annet-) · [Jun 29](https://hashnode.com/posts/my-codeforces-problem-solving-journey-beginner-level/6a42bbc36eb5edab60a765d9) ### [My Codeforces Problem Solving Journey — Beginner Level 🧩](https://html-portfolio.hashnode.dev/my-codeforces-problem-solving-journey-beginner-level?utm_source=hashnode&utm_medium=feed) A beginner-friendly Codeforces problem-solving blog with Python solutions, logic explanations, concepts used, and lessons learned. Covers Team (231A), Next Round (158A), Bit++, Boy or Girl, Petya and Strings, Helpful Maths, and more. 6 min read · [html-portfolio.hashnode.dev](https://html-portfolio.hashnode.dev/my-codeforces-problem-solving-journey-beginner-level?utm_source=hashnode&utm_medium=feed) [Sneha Poojary](https://hashnode.com/@snehapoojary) · [May 26](https://hashnode.com/posts/sliding-window-algorithm/6a153ad57d85e6a1af440213) ### [Sliding Window Algorithm Explained Visually | From Brute Force to Optimization](https://dsamadesimple.hashnode.dev/sliding-window-algorithm?utm_source=hashnode&utm_medium=feed) Master One of the Most Important DSA Patterns 4 min read · [dsamadesimple.hashnode.dev](https://dsamadesimple.hashnode.dev/sliding-window-algorithm?utm_source=hashnode&utm_medium=feed) [Ashdeep Singh](https://hashnode.com/@singhashcdhk006) · [Mar 30](https://hashnode.com/posts/from-900-1200-i-wasn-t-stuck-because-cp-is-hard-i-was-stuck-because-i-was-doing-it-productively-wrong/69cac2f19fffa7474068219e) ### [From 900 → 1200: I wasn’t stuck because CP is hard. I was stuck because I was doing it productively wrong.](https://inventory-login.hashnode.dev/from-900-1200-i-wasn-t-stuck-because-cp-is-hard-i-was-stuck-because-i-was-doing-it-productively-wrong?utm_source=hashnode&utm_medium=feed) codeforce newbie to pupil learnings 8 min read · [inventory-login.hashnode.dev](https://inventory-login.hashnode.dev/from-900-1200-i-wasn-t-stuck-because-cp-is-hard-i-was-stuck-because-i-was-doing-it-productively-wrong?utm_source=hashnode&utm_medium=feed) [Finding Myself](https://hashnode.com/@findingmyself0606) · [Jan 6](https://hashnode.com/posts/new-year-update-15-days-into-ml-oops-struggles-dp-progress-and-college-life-reset/695d7cacb83bc00924b38398) ### [New Year Update: 15 Days Into ML, OOPs Struggles, DP Progress & College Life Reset](https://finding-myself0606.hashnode.dev/new-year-update-15-days-into-ml-oops-struggles-dp-progress-and-college-life-reset?utm_source=hashnode&utm_medium=feed) First of all, Happy New Year everyone! 🎉Here’s a short recap of my last 15 days. I officially started my Machine Learning and Data Science journey a little over two weeks ago. Along with that, I decided to post updates regularly to make sure I stay ... 2 min read · [finding-myself0606.hashnode.dev](https://finding-myself0606.hashnode.dev/new-year-update-15-days-into-ml-oops-struggles-dp-progress-and-college-life-reset?utm_source=hashnode&utm_medium=feed) [Haocheng Lin](https://hashnode.com/@HAOCHENGLIN) · [Nov 1, 2025](https://hashnode.com/posts/from-stacks-to-sparse-tables-reflections-on-two-paths-to-the-same-problem/6906419fc8fc2a5447f35a7c) ### [From Stacks to Sparse Tables: Reflections on Two Paths to the Same Problem](https://codeforcesarchive.hashnode.dev/from-stacks-to-sparse-tables-reflections-on-two-paths-to-the-same-problem?utm_source=hashnode&utm_medium=feed) Two algorithms, one challenge: a stack-based heuristic and a dynamic programming approach tackle the same subarray cost problem. 1 min read · [codeforcesarchive.hashnode.dev](https://codeforcesarchive.hashnode.dev/from-stacks-to-sparse-tables-reflections-on-two-paths-to-the-same-problem?utm_source=hashnode&utm_medium=feed) [Anshul](https://hashnode.com/@geekyyanshul) · [Oct 27, 2025](https://hashnode.com/posts/under-the-hood-of-web-scraping-building-a-profile-scraper-with-nodejs-and-react/68ffd63e69c87546e10de8a1) ### [Under the Hood of Web Scraping – Building a Profile-Scraper with Node.js & React](https://geekyyanshul.hashnode.dev/under-the-hood-of-web-scraping-building-a-profile-scraper-with-nodejs-and-react?utm_source=hashnode&utm_medium=feed) Learn to build a real-time profile scraper using Node.js, Express, Cheerio, and React for a competitive programming dashboard 4 min read · [geekyyanshul.hashnode.dev](https://geekyyanshul.hashnode.dev/under-the-hood-of-web-scraping-building-a-profile-scraper-with-nodejs-and-react?utm_source=hashnode&utm_medium=feed) [1](https://hashnode.com/posts/under-the-hood-of-web-scraping-building-a-profile-scraper-with-nodejs-and-react/68ffd63e69c87546e10de8a1) [Haocheng Lin](https://hashnode.com/@HAOCHENGLIN) · [Oct 24, 2025](https://hashnode.com/posts/codeforces-1060-div-2-problem-d-catshock/68fb4aa1dfa7c82b2a3098f0) ### [Codeforces 1060 (Div 2) Problem D. Catshock](https://codeforcesarchive.hashnode.dev/codeforces-1060-div-2-problem-d-catshock?utm_source=hashnode&utm_medium=feed) Learn how to solve the Catshock problem, a Codeforces challenge about guiding a cat through a tree without getting trapped. 5 min read · [codeforcesarchive.hashnode.dev](https://codeforcesarchive.hashnode.dev/codeforces-1060-div-2-problem-d-catshock?utm_source=hashnode&utm_medium=feed) [Haocheng Lin](https://hashnode.com/@HAOCHENGLIN) · [Oct 15, 2025](https://hashnode.com/posts/reverse-xor-cracking-the-palindrome-code-codeforces-problem/68ef87e719fa8722e924b0b3) ### [Reverse XOR: Cracking the Palindrome Code (Codeforces Problem)](https://codeforcesarchive.hashnode.dev/reverse-xor-cracking-the-palindrome-code-codeforces-problem?utm_source=hashnode&utm_medium=feed) How to apply an elegant trick to solve a Bit Reversal Puzzle. 2 min read · [codeforcesarchive.hashnode.dev](https://codeforcesarchive.hashnode.dev/reverse-xor-cracking-the-palindrome-code-codeforces-problem?utm_source=hashnode&utm_medium=feed)