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Sorting Algorithms · Sorting

Selection Sort

Selection sort repeatedly selects the next smallest item and places it into its final position.

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Student Focus

Students use selection sort to separate comparisons from swaps.

Guided Lesson Notes

How Code Scholars teaches Selection Sort

This guide helps students understand the idea, implement it carefully, explain the runtime, and recognize when the pattern belongs in a larger problem.

In a session, students usually start with a small trace, then write or review code, then test edge cases. The final step is a short explanation: what the structure or algorithm stores, why it is correct, and what changes when the input grows.

Key Ideas

  • Minimum selection
  • Sorted prefix
  • Swap count

Practice Prompts

  • Trace selection sort on random and nearly sorted input.
  • Compare the number of comparisons with insertion sort.

Tutoring Connection

Turn the topic into usable problem-solving skill

Students can use this page before a lesson, after a difficult homework assignment, or while preparing for AP Computer Science A extensions, Advanced Topics in CS, USACO growth, or a college data structures course.

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