Pattern Recognition CS Thinking Example 4
Follow the full solution, then compare it with the other examples linked below.
Example 4
mediumThree tasks all require counting items that meet a condition: counting even numbers in a list, counting absent students, and counting defective bulbs. What common algorithm pattern can be reused?
Solution
- 1 Step 1: All three tasks use the same pattern: start a counter at 0, examine each item, and check whether it matches a condition.
- 2 Step 2: Each time the condition is true, increase the counter by 1. The only thing that changes is the condition being tested.
Answer
Use a counting pattern: set count = 0, loop through items, and increase count whenever the condition is true.
Pattern recognition lets us see that very different situations can share the same underlying structure. Once we spot the common pattern, we can reuse the same algorithmic idea.
About Pattern Recognition
Pattern recognition is the process of identifying similarities, trends, or regularities across data or problems in order to build general solutions. By spotting what is the same across different cases, you can create reusable strategies instead of solving each case from scratch.
Learn more about Pattern Recognition →More Pattern Recognition Examples
Example 1 easy
Look at the sequence: 2, 6, 18, 54, ... Identify the pattern and predict the next number.
Example 2 mediumThree programs are described: (a) calculates total price of items in a shopping cart, (b) calculates
Example 3 easyIdentify the pattern: Monday → M, Tuesday → T, Wednesday → W. How would you extract the first letter