Sudoku.by BinG vs Data Structures and Algorithms

Every puzzle has an answer. A quiet sheet of paper and a problem that works out. sudoku is a minimal, restrained take on the classic — no ads, no tracking, no noise. Just you and the grid. Warm paper white, a single Morandi accent, monospace numerals under a serif title. Open it and solve; finish and let it go quiet. Four difficulties Easy / Medium / Hard / Master. Master ships with world-renowned classic puzzles and a graded bank — from first steps to the very edge. An AI coach that teaches you to think Not just answers. Naked singles, hidden singles, naked pairs, pointing pairs, X-Wing — each technique highlighted right on the board, so you see the logic instead of being handed it. Made for beginners, too A four-step tutorial on the real board: from the rule to the deduction, then straight into your first game. Paper mode Solve like it's newsprint: no mistake limit, nothing flagged, nothing highlighted. The verdict is yours alone. Tools that stay out of the way Pencil notes, undo, erase, hints; instant conflict flags and soft region highlights — all switchable. And more • Bilingual English / 中文, switch anytime • Five Morandi accent colors — pick your taste • 17 illustrated guides, from the rules to master techniques • Share a puzzle as a text token; challenge a friend on the same board • Best times and full history • Carefully tuned haptics and sound • Fully on-device — your data never leaves your phone Pay once, yours forever. No subscriptions, no consumables, no ads. — Independently designed and built. One person, quietly.

DSA is a visual learning app for computer science students, exam prep, and self-learners. Turn abstract data structure concepts into step-by-step animations so you can actually see how algorithms work. WHY DSA • Dual-mode learning: read concept lessons first, then run interactive step-by-step visualizers • Smooth animations: pointer moves, swaps, assignments, and tree restructuring are animated with clear step descriptions • Structured curriculum: organized by textbook chapters from fundamentals to advanced topics • Full playback control: previous/next step, auto-play, speed adjustment, and scrubbing • Multilingual: Simplified Chinese, English, and more COURSE CONTENT Ch. 1 Introduction Asymptotic notation, simplification rules, time & space complexity with examples Ch. 2 Linear Lists, Stacks & Queues Linear lists, stack operations & applications, queue operations & circular queues Ch. 3 Arrays & Matrices Array basics, special matrix compression Ch. 4 Strings BF, KMP, BM string matching, algorithm complexity comparison Ch. 5 Trees Tree basics, binary tree properties & traversals BST, AVL, Splay, B-tree, Red-Black Tree, B+ Tree, Huffman Tree, Union-Find Ch. 6 Graphs Graph basics, storage structures, traversal Minimum spanning tree, shortest paths, topological sort & critical path Ch. 7 Sorting Bubble, Selection, Insertion, Shell, Merge, Quick, Heap Sort Counting, Bucket, Radix Sort Winner Tree, Loser Tree, complexity comparison WHO IT'S FOR • CS / Data Structures students • Exam prep and interview review • Self-learners building a solid DSA foundation FULL UNLOCK One-time purchase unlocks all content. No subscription. No ads. Restore purchases supported. Feedback: Settings → Email Feedback