1 files changed, 94 insertions, 0 deletions
diff --git a/2020/Rust/src/day4.rs b/2020/Rust/src/day4.rs
new file mode 100755
index 0000000..113e838
--- /dev/null
+++ b/2020/Rust/src/day4.rs
@@ -0,0 +1,94 @@
+#[derive(Debug)]
+struct Passport {
+    byr: Option<usize>,
+    iyr: Option<usize>,
+    eyr: Option<usize>,
+    hgt: Option<usize>,
+    hcl: Option<String>,
+    ecl: Option<String>,
+    pid: Option<String>,
+    cid: Option<usize>,
+}
+
+impl Passport {
+    fn new() -> Self {
+        Self {
+            byr: None,
+            iyr: None,
+            eyr: None,
+            hgt: None,
+            hcl: None,
+            ecl: None,
+            pid: None,
+            cid: None,
+        }
+    }
+}
+
+impl From<&str> for Passport {
+    fn from(value: &str) -> Self {
+        let mut passport = Passport::new();
+        let v = value.replace("\n", " ");
+        let v: Vec<&str> = v.split(" ").collect();
+        for ele in v {
+            if ele.is_empty() {
+                continue;
+            }
+            let (key, value) = ele.split_once(':').unwrap();
+            match key {
+                "byr" => passport.byr = Some(value.parse::<usize>().unwrap()),
+                "iyr" => passport.iyr = Some(value.parse::<usize>().unwrap()),
+                "eyr" => passport.eyr = Some(value.parse::<usize>().unwrap()),
+                "hgt" => {
+                    passport.hgt = Some(
+                        value
+                            .trim_end_matches(|c| c == 'c' || c == 'm' || c == 'i' || c == 'n')
+                            .parse::<usize>()
+                            .unwrap(),
+                    )
+                }
+                "hcl" => passport.hcl = Some(value.to_string()),
+                "ecl" => passport.ecl = Some(value.to_string()),
+                "pid" => passport.pid = Some(value.to_string()),
+                "cid" => passport.cid = Some(value.parse::<usize>().unwrap()),
+                _ => unreachable!(),
+            }
+        }
+        passport
+    }
+}
+
+fn solve_part_one(input: &str) -> usize {
+    let mut cnt: usize = 0;
+    let passports: Vec<Passport> = input
+        .split("\n\n")
+        .map(|pass| Passport::from(pass))
+        .collect();
+    for passport in passports {
+        if passport.byr == None
+            || passport.iyr == None
+            || passport.eyr == None
+            || passport.hgt == None
+            || passport.hcl == None
+            || passport.ecl == None
+            || passport.pid == None
+        {
+            continue;
+        }
+        cnt += 1;
+    }
+    cnt
+}
+
+fn solve_part_two(input: &str) -> usize {
+    todo!()
+}
+
+fn main() {
+    let test = include_str!("../input/day_4.test");
+    let prod = include_str!("../input/day_4.prod");
+    println!("Test_1: {}", solve_part_one(test));
+    println!("Prod_1: {}", solve_part_one(prod));
+    // println!("Test_2: {}", solve_part_two(test));
+    // println!("Prod_2: {}", solve_part_two(prod));
+}