2021 day 1 IN RUST

2021/day01/main.rs

@@ -0,0 +1,25 @@
+use std::fs::File;
+use std::io::prelude::*;
+
+fn main() {
+    let mut file = File::open("input.txt")
+        .expect("cannot open file");
+    let mut data = String::new();
+    
+    file.read_to_string(&mut data)
+        .expect("Error while reading file");
+
+    let depths: Vec<i32> = data.lines()
+        .map(|s| s.parse::<i32>().unwrap())
+        .collect();
+
+    let mut j = 0;
+    depths.windows(2)
+        .for_each(|i| if i[1] > i[0] {j+=1});
+
+    let mut k = 0;
+    depths.windows(4)
+        .for_each(|i| if i[1..4].iter().sum::<i32>() > i[0..3].iter().sum::<i32>() {k+=1});
+
+    print!("Part 1: {}\nPart 2: {}", j, k);
+}