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day 3
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‎data/day3.txt‎

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......#..##..#...#...#.###.....
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‎src/main.rs‎

Lines changed: 68 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -150,7 +150,74 @@ fn test_day2_part1() {
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);
151151
}
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fn day3_calc(map: &Vec<String>, right: usize, down: usize) -> usize {
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let mut cnt: usize = 0;
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let mut n: usize = 0;
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for i in (0..map.len()).step_by(down) {
157+
if i == 0 {
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continue;
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}
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n = n + 1;
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let row: &String = &map[i];
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let p: usize = n * right;
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if row.chars().nth(p % row.len()).unwrap_or('\0') == '#' {
164+
cnt = cnt + 1;
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}
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}
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return cnt;
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}
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#[test]
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fn test_day3_calc() {
172+
let map: Vec<String> = vec![
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String::from("..##......."),
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String::from("#...#...#.."),
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String::from(".#....#..#."),
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String::from("..#.#...#.#"),
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String::from(".#...##..#."),
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String::from("..#.##....."),
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String::from(".#.#.#....#"),
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String::from(".#........#"),
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String::from("#.##...#..."),
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String::from("#...##....#"),
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String::from(".#..#...#.#"),
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];
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assert_eq!(2, day3_calc(&map, 1, 1));
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assert_eq!(7, day3_calc(&map, 3, 1));
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assert_eq!(3, day3_calc(&map, 5, 1));
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assert_eq!(4, day3_calc(&map, 7, 1));
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assert_eq!(2, day3_calc(&map, 1, 2));
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}
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fn day3_part1(map: &Vec<String>) -> usize {
192+
return day3_calc(map, 3, 1);
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}
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fn day3_part2(map: &Vec<String>) -> usize {
196+
let a1 = day3_calc(map, 1, 1);
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let a2 = day3_calc(map, 3, 1);
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let a3 = day3_calc(map, 5, 1);
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let a4 = day3_calc(map, 7, 1);
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let a5 = day3_calc(map, 1, 2);
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return a1 * a2 * a3 * a4 * a5;
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}
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fn day3() {
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println!("day3");
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let mut map: Vec<String> = Vec::new();
208+
if let Ok(lines) = read_lines("data/day3.txt") {
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for line in lines {
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if let Ok(v) = line {
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map.push(v);
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}
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}
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}
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println!("{}", day3_part1(&map));
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println!("{}", day3_part2(&map));
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}
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153219
fn main() {
154220
// day1();
155-
day2();
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//day2();
222+
day3();
156223
}

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