Edexcel Computer Science Algorithms Revision Notes

• 1An algorithm must have a clear starting point and a defined end.
• 2Algorithms can be expressed in various forms, including natural language, pseudocode, and flowcharts.
• 3Efficiency can be measured in terms of time complexity and space complexity.
• 4Common algorithm types include sorting, searching, and graph algorithms.
• 5Understanding algorithms is crucial for optimizing code and improving performance.

An algorithm is like a recipe that tells a computer how to solve a problem step by step. It starts with an input, follows specific instructions, and ends with an output. Just like a recipe can be written in different ways, algorithms can be described in plain language, pseudocode, or diagrams. Learning algorithms helps you write better programs that run faster and use less memory.