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54 lines
1.2 KiB
54 lines
1.2 KiB
use std::error;
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use std::fs::File;
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use std::io::BufRead;
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use std::io::BufReader;
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const DEBUG: bool = false;
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fn main() -> Result<(), Box<dyn error::Error>> {
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let f = File::open("input.txt")?;
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let reader = BufReader::new(f);
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let mut strength_sum = 0;
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let mut strength = 1;
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let mut cycle = 1;
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for line in reader.lines() {
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let line = line?;
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let mut split_iter = line.split_whitespace();
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let cmd = split_iter.next().ok_or("asdf")?;
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match cmd {
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"noop" => {
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cycle += 1;
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if (cycle % 40) == 20 {
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strength_sum += strength * cycle;
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if DEBUG {
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println!("{} {} {}", cycle, strength, strength * cycle)
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}
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}
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},
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"addx" => {
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cycle += 1;
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if (cycle % 40) == 20 {
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strength_sum += strength * cycle;
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if DEBUG {
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println!("{} {} {}", cycle, strength, strength * cycle)
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}
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}
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cycle += 1;
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let num: i32 = split_iter.next().ok_or("bla")?.parse()?;
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strength += num;
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if (cycle % 40) == 20 {
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strength_sum += strength * cycle;
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if DEBUG {
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println!("{} {} {}", cycle, strength, strength * cycle)
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}
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}
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},
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_ => Err(format!("Unknown command: {}", cmd))?
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};
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}
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println!("Signal strength is {}", strength_sum);
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Ok(())
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}
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