Significance:
The Hamming distance between two equal-length sequences is the simplest possible model of point mutations (SNPs) — the same idea underlying variant calling pipelines that compare a patient's read to a reference genome. It also underlies barcode/UMI error-correction schemes used in Illumina sequencing.
Statement
Given two DNA strings of equal length, count the number of positions at which the corresponding symbols differ.
Sample Input
GAGCCTACTAACGGGAT
CATCGTAATGACGGCCT
Sample Output
7
Constraints
- `1 ≤ length ≤ 1000` for both strings - Both strings are guaranteed to have the **same length**
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