# HAMM: Counting Point Mutations

Given two strings and of equal length, the Hamming distance between and , denoted , is the number of corresponding symbols that differ in and . See Figure 2.

Given: Two DNA strings and of equal length (not exceeding 1 kbp).

Return: The Hamming distance .

## Sample Dataset

```
GAGCCTACTAACGGGAT
CATCGTAATGACGGCCT
```

## Sample Output

```
7
```

# R

```
library(readr)
library(magrittr)
f <- "hamm.txt"
dna <-
read_csv(f, col_names = FALSE)$X1 %>%
strsplit(split = NULL)
sum(dna[[1]] != dna[[2]]) %>%
cat()
```

```
7
```