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Bioinformatics Algorithms

Coding Challenge: Implement Pattern Count

Explore how to implement the pattern count algorithm to identify the number of times a specific DNA pattern appears in a larger sequence. This lesson helps you practice string matching techniques essential for genome sequence analysis and understanding computational biology challenges.

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Pattern frequency

Pattern Count Problem

Problem overview:
Provided with two strings, Text and Pattern, find the number of times Pattern is repeated in Text.


Input: Strings Text and Pattern.
Output: Count(Text, Pattern).

Sample dataset:

GCGCG
GCG

Sample output:

2

Python
def PatternCount(Text, Pattern):
    count = 0
    # Write your code here
    return count

Solution explanation

  • Line 2: We define the variable count for storing the pattern count.
  • Lines 3–5: We iterate over Text to find the provided Pattern in that text.
    • Line 4: We check if the substring from i to the length of the pattern is equal to Pattern.
    • Line 5: We increment the count if the condition is met.