OCR J277/02 – 2.1 – Algorithms

Posted on by Administrator Posted in J277 - Computer Science GCSE (OCR)
2.1 – Algorithms - Overview / Checklist
2.1.1 Computational thinking
Principles of computational thinking:

    Abstraction
    Decomposition
    Algorithmic thinking
2.1.2 Designing, creating and refining algorithms
Identify the inputs, processes, and outputs for a problem
Structure diagrams
Create, interpret, correct, complete, and refine algorithms using:

    Pseudocode
    Flowcharts
    Reference language/high-level programming language

Identify common errors
Trace tables

2.1.3 Searching and sorting algorithms
Standard searching algorithms:

    Binary search
    Linear search

Standard sorting algorithms:

    Bubble sort
    Merge sort
    Insertion sort

Recommended Resources

2.1.1 Computational thinking

Abstraction, Decomposition and Structure Diagrams

Structure Diagram for an online-shop

Pizza Robot – Flowchart


2.1.2 Designing, creating and refining algorithms

The Marauder’s Map Coding Challenges

The Jorvik Viking Settlement​

The Legend of Pachacuti’s Golden Shield

The Lost Roman Sundial

Tutankhamun’s Papyrus

MI6: Mission Alpha

Blackbeard’s Hidden Treasures

Code Breaker Challenges – Series 1


Code Breaker Challenges – Series 2 Code Breaker Challenges – Series 3

Flowchart Prediction Tables

Using Trace Tables


Trace Tables Challenge Flags of the world (Flowchart) Murder Mystery

2.1.3 Searching and sorting algorithms

Bubble Sort vs. Insertion Sort

Merge Sort Algorithm

Sorting Algorithms

Searching & Sorting Algorithms Practice

Linear Search Functions


BubbleSort Algorithm – Visualisation Insertion Sort Algorithm – Visualisation

Further Reading…

Extra Resources
Sorting Algorithms – Python Code Sorting Playing Cards Shuffling Algorithm (Python Challenge) The Sorting Balance Interactive Bubble Sort Interactive Insertion Sort

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