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use std::io::{self, Read};
fn solve(input: &str) -> u32 {
let mut sum = 0;
let chars = input.chars();
let nexts = input.chars().cycle().skip(1);
for (a, b) in chars.zip(nexts) {
if a == b {
sum += a.to_digit(10).unwrap();
}
}
sum
}
fn main() {
let mut input = String::new();
io::stdin().read_to_string(&mut input).unwrap();
println!("Part 1: {}", solve(input.trim()));
}
#[test]
fn part1() {
assert_eq!(3, solve("1122"));
assert_eq!(4, solve("1111"));
assert_eq!(0, solve("1234"));
assert_eq!(9, solve("91212129"));
}
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