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VisuAlgo — Algorithm Visualization Tool

Introduction

VisuAlgo is a data structure and visualization tool developed by Professor Steven Halim from the National University of Singapore. It's not a traditional "course" but an interactive website that lets you see the dynamic execution process of various data structures and algorithms.

On VisuAlgo, you can watch: step-by-step element swaps in sorting algorithms, BST insertion and deletion processes, how Dijkstra's algorithm finds shortest paths one step at a time, how BFS/DFS traverses a graph, how hash tables handle collisions — these animated demonstrations make abstract algorithms tangible and intuitive.

For self-learners, VisuAlgo is one of the best supplementary tools available. After learning an algorithm, watching the animation here helps you connect the code with the algorithm's execution process.

Prerequisites

None. VisuAlgo is suitable for learners at any stage.

Difficulty

🌟 (Beginner)

This is a tool, not a course. The barrier to entry is extremely low — just open the website and use it.

Estimated Study Hours

Use as needed. Recommended: spend 10-15 minutes on VisuAlgo after learning each algorithm to watch the corresponding animation.

Resources

  • Website: visualgo.net
  • Languages: Chinese, English, and more
  • Topics covered: sorting, linked lists, stacks, queues, hash tables, BST, AVL trees, heaps, graphs, union-find, dynamic programming, and more

Self-Study Tips

  1. Watch the animation right after learning an algorithm. For example, after learning quicksort, go to VisuAlgo and watch a complete sorting animation — you'll gain a whole new understanding of the partition process.

  2. Input your own data. VisuAlgo lets you enter custom data and watch how the algorithm processes it. This is more educational than watching preset demonstrations.

  3. Use alongside problem-solving. When you encounter an algorithm problem on LeetCode that you can't solve, go to VisuAlgo first to watch the corresponding algorithm demo, then come back to the problem.

  4. Focus on graph algorithm visualizations. Graph algorithms (Dijkstra, BFS/DFS, topological sort, minimum spanning trees) are the hardest to visualize in your head — VisuAlgo's animations are most valuable here.

  5. Don't just watch — implement. VisuAlgo is a supplement, not a replacement for writing code. After watching the animation, close the website and implement the algorithm yourself.