d3p1 optimized

day3/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day3"
+version = "0.1.0"

day3/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "day3"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day3/input.txt

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day3/src/main.rs

@@ -0,0 +1,28 @@
+use std::env;
+use std::fs;
+use std::collections::HashSet;
+
+fn main() {
+    let input = fs::read_to_string(&env::args().nth(1).unwrap()).unwrap();
+
+    let mut sum: u64 = 0;
+    for line in input.lines() {
+        let mut left_chars: HashSet<char> = HashSet::new();
+
+        for (i, c) in line.char_indices() {
+            if i < line.len()/2 {
+                left_chars.insert(c);
+            } else if left_chars.contains(&c) {
+                if c >= 'a' && c <= 'z' {
+                    sum += (c as u64) - ('a' as u64) + 1;
+                } else {
+                    sum += (c as u64) - ('A' as u64) + 27;
+                }
+                break;
+            }
+        }
+    }
+
+    println!("{:?}", sum);
+}
+

day3/test.txt

@@ -0,0 +1,6 @@
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+PmmdzqPrVvPwwTWBwg
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+ttgJtRGJQctTZtZT
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