Copy from github.com with solutions for days 1+2

2022/day01-part2/src/main.rs

@@ -0,0 +1,51 @@
+fn main() {
+    // Use command line arguments to specify the input filename.
+    let args: Vec<String> = std::env::args().collect();
+    if args.len() < 2 {
+        panic!("Usage: ./main <input-file>\nNo input file provided. Exiting.");
+    }
+
+    // Next, read the contents of the input file into a string for easier processing.
+    let input = std::fs::read_to_string(&args[1]).expect("Error opening file");
+    // Line-by-line processing is easiest.
+    let mut input = input.lines();
+
+    // --- TASK BEGIN ---
+
+    // Keep track of the largest calorie-count and the "current" calorie-count.
+    let mut max_cals = [0u32, 0, 0];
+    let mut cals = 0u32;
+
+    // Iterate line-by-line.
+    while let Some(line) = input.next() {
+        match line.parse::<u32>() {
+            Ok(num) => cals += num,
+            Err(_) => {
+                update_cals(cals, &mut max_cals);
+                cals = 0;
+            }
+        }
+    }
+    // Don't forget to check the very last block.
+    update_cals(cals, &mut max_cals);
+
+    println!("Maximum Calories");
+    for (i, mc) in max_cals.into_iter().enumerate() {
+        println!("  No. {} : {}", i + 1, mc);
+    }
+
+    println!("Total Calories: {}", max_cals.iter().sum::<u32>())
+}
+
+fn update_cals(cals: u32, max_cals: &mut [u32; 3]) {
+    if cals > max_cals[0] {
+        max_cals[2] = max_cals[1];
+        max_cals[1] = max_cals[0];
+        max_cals[0] = cals;
+    } else if cals > max_cals[1] {
+        max_cals[2] = max_cals[1];
+        max_cals[1] = cals;
+    } else if cals > max_cals[2] {
+        max_cals[2] = cals;
+    }
+}