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use std::collections::HashSet;
fn solve_functional(data: &str, window: usize) -> usize {
data.as_bytes()
.windows(window)
.map(|arr| {
arr.into_iter()
.map(|ele| *ele as usize)
.collect::<HashSet<_>>()
})
.position(|set| set.len() == window)
.unwrap()
+ window
}
fn solve_part_one(data: &str) -> usize {
let v: Vec<char> = data.chars().collect();
for i in 0..v.len() - 4 {
let mut st: HashSet<char> = HashSet::new();
for j in i..i + 4 {
st.insert(v[j]);
}
if st.len() == 4 {
return i + 4;
}
}
unreachable!()
}
fn solve_part_two(data: &str) -> usize {
let v: Vec<char> = data.chars().collect();
for i in 0..v.len() - 14 {
let mut st: HashSet<char> = HashSet::new();
for j in i..i + 14 {
st.insert(v[j]);
}
if st.len() == 14 {
return i + 14;
}
}
unreachable!()
}
fn main() {
let data_test = include_str!("../data/day6.test");
let data_prod = include_str!("../data/day6.prod");
println!("{}", solve_part_one(data_test));
println!("{}", solve_part_one(data_prod));
println!("{}", solve_part_two(data_test));
println!("{}", solve_part_two(data_prod));
println!("{}", solve_functional(data_test, 4));
println!("{}", solve_functional(data_prod, 4));
println!("{}", solve_functional(data_test, 14));
println!("{}", solve_functional(data_prod, 14));
}
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