pad numbers on directory names

day01/src/main1.rs

@@ -0,0 +1,25 @@
+use std::env;
+use std::fs::File;
+use std::io::BufReader;
+use std::io::BufRead;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let input = &args[1];
+    let reader = BufReader::new(File::open(input).expect("where file?"));
+
+    let mut sum: i64 = 0;
+    let mut max: i64 = 0;
+    for line in reader.lines() {
+        if !line.as_ref().unwrap().trim().is_empty() {
+            sum += line.unwrap().parse::<i64>().unwrap();
+        } else {
+            if sum > max {
+                max = sum;
+            }
+            sum = 0;
+        }
+    }
+
+    println!("Max: {}", max);
+}