computer-science Verified Precision Tool
Insertion Sort Visualizer & Step Generator
Interactive Insertion Sort step generator showing array shifts and key element insertion.
Interactive Algorithm Visualizer
Insertion Sort
Enter your custom input data → Run the real algorithm engine → Observe step transitions.
⚙️ Customize Algorithm Input Data
Step 1 of 19⚡ Algorithm Running
WHAT HAPPENED?
Sub-array at index 0 is trivially sorted.
WHY?
Algorithm state rule requirement
WHAT CHANGED?
State pointers updated
64[0]
25[1]
12[2]
22[3]
11[4]
Mathematical Formula
Insert key arr[i] into sorted subsegment arr[0..i-1]
Overview & Explanation
Insertion sort builds the final sorted array one item at a time, similar to sorting playing cards in hand.
How It Works
- Iterate from arr[1] to arr[n-1].
- Compare current key element with preceding elements.
- Shift elements greater than key one position ahead.
Practical Applications
- Fast sorting for nearly-sorted arrays
- Online real-time stream sorting
Insertion Sort Example
Sorting [12, 11, 13, 5, 6]
1
Insert 11
Shift 12
= [11, 12, 13, 5, 6]
2
Insert 5
Shift 13, 12, 11
= [5, 11, 12, 13, 6]
Frequently Asked Questions
When is Insertion Sort efficient?
Insertion Sort is very fast for small arrays (n < 15) or nearly sorted data.
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