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day1: code gold
+5
-23
+5
-23
src/main.rs
+5
-23
src/main.rs
···
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5
times_crossed: i32,
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6
}
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7
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-
fn split_line(line: &str) -> (&str, i32) {
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-
let (dir, num) = line.split_at(1);
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(dir, num.parse::<i32>().unwrap())
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-
}
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-
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fn main() {
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let content = fs::read_to_string("inputs/1.txt").expect("failed to read input file");
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let res = content.lines().fold(
···
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times_crossed: 0,
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},
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|mut acc, line| {
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let (dir, num) = split_line(line);
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acc.times_crossed += match dir {
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-
"L" => {
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let old_sum = acc.sum;
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acc.sum -= num;
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if old_sum != 0 && acc.sum < 0 { 1 } else { 0 }
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}
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"R" => {
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acc.sum += num;
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0
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}
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_ => unreachable!(),
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-
};
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if acc.sum == 0 {
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acc.times_crossed += 1;
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} else {
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acc.times_crossed += (acc.sum / 100).abs();
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-
}
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+
let n: i32 = line[1..].parse().unwrap();
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+
let old = acc.sum;
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+
acc.sum += if &line[..1] == "L" { -n } else { n };
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+
acc.times_crossed += (old > 0 && acc.sum < 0) as i32
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+
+ if acc.sum == 0 { 1 } else { (acc.sum / 100).abs() };
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acc.sum = acc.sum.rem_euclid(100);
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acc
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},