Visualize & Master
Algorithms Step-by-Step.
Interactive animations, real-time code highlighting, and speed controls for every data structure.
Bubble Sort
Repeatedly steps through the list, compares adjacent elements, and swaps them if they are in the wrong order.
Selection Sort
Divides the list into a sorted and unsorted region, repeatedly selecting the smallest element from the unsorted region.
Insertion Sort
Builds the final sorted array one item at a time by inserting each element into its proper position among sorted items.
Quick Sort
Picks an element as a pivot and partitions the given array around the picked pivot using divide and conquer.
Merge Sort
Divides array into halves, recursively sorts them, and then merges the two sorted halves back together.
Binary Search
Search algorithm that finds the position of a target value within a sorted array by dividing search space in half.
Dijkstra's Algorithm
Finds the shortest paths between nodes in a weighted graph with non-negative edge weights.
Bellman-Ford Algorithm
Single-source shortest path algorithm that handles negative edge weights and detects negative weight cycles.
BFS Traversal (Breadth-First)
Level-by-level graph traversal algorithm using a Queue (FIFO) to explore neighboring nodes in expanding ripples.
DFS Traversal (Depth-First)
Deep branch graph traversal algorithm using a Stack (LIFO / Recursion) to explore down each path before backtracking.
KMP String Search (Knuth-Morris-Pratt)
Efficient string pattern matching algorithm using a precomputed Longest Prefix Suffix (LPS) table to skip redundant character comparisons.
Master Data Structures & Algorithms Through Visual Execution
SnapDevCode DSA Visualizer transforms abstract computer science theory into intuitive step-by-step animations. Watch pointer movements, array element swaps, recursion trees, and shortest-path edge relaxations unfold in real time.
String Pattern Matching
Understand linear time sub-string searches like the Knuth-Morris-Pratt (KMP) algorithm. Learn how the Longest Prefix Suffix (LPS) array avoids redundant comparisons.
Graph Traversals & Shortest Paths
Explore Breadth-First Search (BFS), Depth-First Search (DFS), and Dijkstra’s algorithm on weighted directional graphs with live adjacency list inspections.
Sorting & Divide-and-Conquer
Contrast quadratic sorting routines (Bubble, Selection, Insertion) with logarithmic divide-and-conquer powerhouses (Merge Sort, Quick Sort).
Asymptotic Time & Space Complexity Cheat Sheet
Quick reference guide for Big-O bounds across all visualized algorithms:
| Algorithm | Best Time | Average Time | Worst Time | Space Complexity |
|---|---|---|---|---|
| Binary Search | O(1) | O(log N) | O(log N) | O(1) |
| Merge Sort | O(N log N) | O(N log N) | O(N log N) | O(N) |
| Quick Sort | O(N log N) | O(N log N) | O(N²) | O(log N) |
| KMP String Search | O(N) | O(N + M) | O(N + M) | O(M) |
| Dijkstra’s Algorithm | O((V + E) log V) | O((V + E) log V) | O((V + E) log V) | O(V) |
| Bellman-Ford Algorithm | O(E) | O(V · E) | O(V · E) | O(V) |
| BFS / DFS Graph Traversal | O(V + E) | O(V + E) | O(V + E) | O(V) |
| Bubble / Insertion / Selection Sort | O(N) / O(N²) | O(N²) | O(N²) | O(1) |
How to Use Visualizers to Ace FAANG & Big Tech Coding Interviews
Use the step-by-step debugger to observe how pointers (e.g. low, mid, high in Binary Search) preserve invariants across every iteration.
Test boundary inputs (single-element arrays, already sorted arrays, reverse sorted arrays, duplicate elements) to see how early-exit conditions trigger.
Inspect our synchronized execution lines on the right panel to understand exactly which line of source code executes during each visual phase transition.
Click on the linked LeetCode problem mappings on each visualizer card to practice and apply what you learned in a full coding sandbox environment.
Frequently Asked Questions (FAQ)
Answers to common inquiries regarding algorithm simulation, controls, and sound synthesis:
Can I step backwards to debug algorithmic logic?
Yes! All SnapDevCode visualizers feature bidirectional timeline controls (Step Forward, Step Back, Pause, and Reset) with a full recorded state history stack.
What is audio sonification in the visualizers?
We synthesize real-time sound frequencies using the Web Audio API corresponding to array values and comparison events, helping you hear algorithmic sorting patterns.
Can I suggest new algorithms for SnapDevCode to visualize?
Yes! Click the "Wishlist / Suggest" button at the top of the page to submit requests for Dynamic Programming, Red-Black Trees, or Trie visualizers.