VISUAL DSA WORKSPACEDSA you
DSA you
can see.
Stop imagining how code runs. Knacktor makes the algorithm visibly execute in front of you — real Python, animated data structures, live variables and complexity, all in sync.
Real execution, not fake animation Beginner-first, interview-ready
TWO_SUM.PY · two pointersLIVE
1 + 11 = 12> target 10
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lo
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4
6
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11
hi
▸ WHAT'S HAPPENING
Pointers at both ends. Sum 1 + 11 = 12 overshoots the target.
Step 1 / 5
HOW IT WORKS
Five things, perfectly in sync
Code, motion, state, narration and complexity all move together — so you understand not just what runs, but why it works.
Real code
Actual Python highlights line by line as it runs.
Live structures
Arrays, trees and graphs animate step by step.
Visible state
Variables appear and flash the instant they change.
Narration
Plain-language explanation of what and why.
Live complexity
Counters and meters make Big-O tangible.
THE OLD WAY
Read it. Simulate it in your head.
def two_sum(nums, t):
lo, hi = 0, len(nums)-1
while lo < hi:
s = nums[lo]+nums[hi]
if s == t: return [lo, hi]
elif s < t: lo += 1
else: hi -= 1
You trace pointers on scratch paper, lose track of state, and memorize patterns you never truly saw move.
THE KNACKTOR WAY
Watch it solve itself.
3
1
4
1
5
9
The window slides, variables flash, the answer appears. Understanding lands in seconds — and it sticks.
EVERY STRUCTURE, ANIMATED
From arrays to graphs — see them move
Twenty-plus structures and patterns, each with cinematic, beginner-clear motion built from the real interface.
3
→7
→1
→∅
Linked Lists
Watch pointers walk, reverse and reconnect node by node.
push / pop
Stacks & Queues
See LIFO and FIFO order play out as items enter and leave.
compare · swap
1
5
3
4
6
Sorting
Compare, swap and partition — every exchange made visible.
BFS order
ABCDEFG
Trees & Traversal
DFS and BFS light up the path through every node in order.
BFS frontier
1234
Graphs
Edges flow and frontiers expand across BFS, DFS and Dijkstra.
0·
142
2·
317
Hash Maps
Keys hash into buckets and collisions resolve in real time.
WHO IT'S FOR
Built for the moment it finally clicks
The beginner
Start from zero. Watch each step build intuition before you ever memorize a pattern.
“Make me understand this.”
Interview prep
Revise patterns fast with compare mode and recognizable problems mapped to techniques.
“Help me revise patterns.”
The educator
Step to an exact moment and explain it. The visual does the heavy lifting for you.
“Let me step through it.”
FEATURED
View all 480 →Problems you already know — finally clear
Stop reading algorithms.
Start watching them.
Open any problem and see the code, the data and the explanation move as one.