day3 part1

day3/rust/Cargo.toml

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

day3/rust/src/main.rs

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+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string("../input.txt").expect("Could not read file");
+
+    let report: Vec<&str> = input.lines().collect();
+    let bit_count = report[0].len();
+    let col_size = report.len();
+
+    let mut gamma = 0;
+    let mut epsilon = 0;
+
+    for position in 0..bit_count {
+        gamma <<= 1;
+        epsilon <<= 1;
+
+        let count = report
+            .iter()
+            .filter(|b| b.chars().nth(position).unwrap() == '1')
+            .count();
+
+        if count > col_size / 2 {
+            gamma += 1;
+        } else {
+            epsilon += 1;
+        }
+    }
+    println!("{}", gamma * epsilon);
+    // part1(input);
+    // part2(&commands);
+}
+
+// fn part1(report: String) {
+//     for i in 1..5 {
+//         let (ones, zeros): (Vec<&str>, Vec<&str>) =
+//             report.lines().partition(|l| l[i..l.len()].starts_with('1'));
+//         println!("{:?}", zeros);
+//     }
+// }
+
+// fn part2(commands: &Vec<(&str, i32)>) {
+//     todo!();
+// }