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day1 solution

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Andrew Coleman 2018-12-03 13:18:08 -05:00
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2018/day1/Cargo.lock generated Normal file
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[[package]]
name = "day1"
version = "0.1.0"

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[package]
name = "day1"
version = "0.1.0"
authors = ["Andrew Coleman <penguincoder@gmail.com>"]
[dependencies]

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use std::fs::File;
use std::io::{BufRead, BufReader};
use std::iter::Iterator;
fn print_final_frequency(ints: &Vec<i32>) {
let mut frequency = 0;
for drift in ints {
frequency = frequency + drift;
}
println!("frequency is {}", frequency)
}
fn print_first_duped_frequency(line_count: usize, offsets: &Vec<i32>) {
let mut freaks: Vec<i32> = vec![0];
let first_duped_frequency = duped_frequency(0, line_count, offsets, &mut freaks);
println!("first duped frequency is {}", first_duped_frequency);
}
fn duped_frequency(
index: usize,
max_count: usize,
offsets: &Vec<i32>,
freaks: &mut Vec<i32>,
) -> i32 {
let cur_offset = offsets.get(index).unwrap();
let next_freq = freaks.last().unwrap() + cur_offset;
let mut found = false;
for freq in freaks.iter() {
if freq == &next_freq {
found = true;
break;
}
}
if found {
next_freq
} else {
let next_index = (index + 1) % max_count;
freaks.push(next_freq);
duped_frequency(next_index, max_count, offsets, freaks)
}
}
fn main() {
let ints: Vec<i32> = BufReader::new(File::open("input").unwrap())
.lines()
.map(|line| line.unwrap().parse::<i32>().unwrap())
.collect();
let line_count: usize = ints.len();
print_final_frequency(&ints);
print_first_duped_frequency(line_count, &ints)
}