Third task

03/03.rs

@@ -0,0 +1,32 @@
+use std::fs;
+
+fn count(field: &Vec<Vec<char>>, dx: usize, dy: usize) -> usize {
+    let mut x = 0;
+    let mut y = 0;
+    let mut count = 0;
+    while y < field.len() {
+        if field[y][x] == '#' {
+            count += 1;
+        }
+        x = (x + dx) % field[0].len();
+        y += dy;
+    }
+    return count;
+}
+
+fn main() {
+    let contents = fs::read_to_string("input").unwrap();
+    let mut field: Vec<Vec<char>> = vec![];
+    for line in contents.lines() {
+        field.push(line.chars().collect());
+    }
+    println!(
+        "{} {}",
+        count(&field, 3, 1),
+        count(&field, 1, 1)
+            * count(&field, 3, 1)
+            * count(&field, 5, 1)
+            * count(&field, 7, 1)
+            * count(&field, 1, 2)
+    )
+}