feat: day 06 part a

data/examples/06.txt

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+Time:      7  15   30
+Distance:  9  40  200

src/bin/06.rs

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+advent_of_code::solution!(6);
+
+pub fn part_one(input: &str) -> Option<u32> {
+    let mut lines = input.lines();
+    let times: Vec<u32> = lines
+        .next()
+        .unwrap()
+        .split(':')
+        .last()
+        .unwrap()
+        .split_ascii_whitespace()
+        .map(|a| a.parse::<u32>().unwrap())
+        .collect();
+
+    let distances: Vec<u32> = lines
+        .next()
+        .unwrap()
+        .split(':')
+        .last()
+        .unwrap()
+        .split_ascii_whitespace()
+        .map(|a| a.parse::<u32>().unwrap())
+        .collect();
+
+    println!("{:?}", times);
+    println!("{:?}", distances);
+
+    let mut sums: Vec<u32> = Vec::new();
+    for i in 0..times.len() {
+        let mut best_counts = 0u32;
+        let time = times[i];
+        let record = distances[i];
+        for speed in 0..time {
+            let time_left = time - speed;
+            if time_left * speed >= record {
+                best_counts += 1;
+            }
+        }
+        sums.push(best_counts);
+    }
+    println!("SUM -> {:?}", sums);
+    return sums.iter().cloned().reduce(|a, b| a * b);
+}
+
+pub fn part_two(input: &str) -> Option<u32> {
+    None
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part_one() {
+        let result = part_one(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, Some(288u32));
+    }
+
+    #[test]
+    fn test_part_two() {
+        let result = part_two(&advent_of_code::template::read_file("examples", DAY));
+        assert_eq!(result, None);
+    }
+}