3.1 Fundamentals of AlgorithmsStudy Notes

Deep Dive: 2D Arrays

Part of Insertion Sort · GCSE GCSE Computer Science revision

This study notes covers Deep Dive: 2D Arrays within Insertion Sort for GCSE Computer Science. Revise Insertion Sort in 3.1 Fundamentals of Algorithms for GCSE Computer Science with 15 exam-style questions and 10 flashcards. This topic appears regularly enough that it should still be part of a steady revision cycle. It is section 4 of 8 in this topic. Use this study notes to connect the idea to the wider topic before moving on to questions and flashcards.

Topic position

Section 4 of 8

Practice

15 questions

Recall

10 flashcards

Deep Dive: 2D Arrays

A 2D array is like a table or grid:

// Noughts and Crosses board
array board[3, 3]

board[0, 0] = "X"
board[1, 1] = "O"
board[2, 2] = "X"

// Visualised:
// [X][ ][ ]
// [ ][O][ ]
// [ ][ ][X]

First index = row, Second index = column

Keep building this topic

Read this section alongside the surrounding pages in Insertion Sort. That gives you the full topic sequence instead of a single isolated revision point.

Arrays Deep Dive: Records Video Lesson Organising Data

Practice Questions for Insertion Sort

Which statement best describes how insertion sort works?

A. It repeatedly swaps adjacent elements until the list is sorted
B. It divides the list in half repeatedly and merges sorted halves
C. It takes each element and inserts it into its correct position in the already sorted portion
D. It selects the smallest element and swaps it to the front each pass

1 markfoundation

Describe how insertion sort works. Your answer should include how the algorithm processes each element.

3 marksstandard

Quick Recall Flashcards

What is the time complexity of insertion sort?

O(n²) worst/average case, O(n) best case (already sorted)

How does insertion sort work?

Builds sorted list one element at a time by inserting each element into its correct position

15 questions on Insertion Sort — practise free

Instant marking, adaptive difficulty, and 10 spaced repetition flashcards. Free until your GCSEs.

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Arrays

Deep Dive: Records