day 2

src/main.rs

@@ -2,10 +2,13 @@ extern crate reqwest;
 extern crate tempfile;
 
 use crate::problem1::part1::Problem1;
+use crate::problem2::part2::Problem2;
 
 mod problem1;
+mod problem2;
 mod util;
 
+
 pub trait Problem {
     // Parses input and generates state
     fn new(input: &String) -> Self;
@@ -16,7 +19,11 @@ pub trait Problem {
 }
 
 fn main() {
-    let problem1 = Problem1::new(&util::get_problem(1));
-    problem1.run_part1();
-    problem1.run_part2();
+    // let problem1 = Problem1::new(&util::get_problem(1));
+    // problem1.run_part1();
+    // problem1.run_part2();
+
+    let problem2 = Problem2::new(&util::get_problem(2));
+    problem2.run_part1();
+    problem2.run_part2();
 }

src/problem2/mod.rs

@@ -0,0 +1 @@
+pub mod part2;

src/problem2/part2.rs

@@ -0,0 +1,82 @@
+/*
+Each line gives the password policy and then the password.
+The password policy indicates the lowest and highest number
+of times a given letter must appear for the password to be
+valid. For example, 1-3 a means that the password must
+contain a at least 1 time and at most 3 times.
+
+Each policy actually describes two positions in the password,
+where 1 means the first character, 2 means the second character,
+and so on. (Be careful; Toboggan Corporate Policies have no
+concept of "index zero"!) Exactly one of these positions must
+contain the given letter. Other occurrences of the letter are
+irrelevant for the purposes of policy enforcement.
+*/
+
+use crate::Problem;
+
+pub struct Problem2 {
+    password_list: Vec<(String, String, String)>,
+}
+
+impl Problem2 {}
+
+impl Problem for Problem2 {
+    fn new(input: &String) -> Self {
+        Problem2 {
+            password_list: input
+                .split("\n")
+                .filter_map(|s| {
+                    let s = s.trim();
+                    if s.len() < 2 {
+                        return None
+                    }
+                    let mut iter = s.split(" ");
+                    let range = iter.next().unwrap();
+                    let val = iter.next().unwrap().replace(':',"");
+                    let password = iter.next().unwrap();
+
+                    Some((range.to_string(), val.to_string(), password.to_string()))
+                }).collect(),
+        }
+    }
+
+    fn run_part1(&self) {
+        let mut valid_passwords = 0;
+        for set in &self.password_list {
+            let mut range_iter = set.0.split("-");
+            let min = range_iter.next().unwrap().parse::<i32>().unwrap();
+            let max = range_iter.next().unwrap().parse::<i32>().unwrap();
+
+            let count = set.2.matches(&set.1).count() as i32;
+            if count >= min && count <= max {
+                valid_passwords += 1;
+                //println!("{} {} {}", set.0, set.1, set.2)
+            }
+        }
+        println!("{}", valid_passwords)
+    }
+
+    fn run_part2(&self) {
+        let mut valid_passwords = 0;
+        for set in &self.password_list {
+            let mut range_iter = set.0.split("-");
+            let first = range_iter.next().unwrap().parse::<usize>().unwrap();
+            let second = range_iter.next().unwrap().parse::<usize>().unwrap();
+
+            let a = set.2.get((first - 1)..first).unwrap();
+            let b = set.2.get((second - 1)..second).unwrap();
+
+            if a == set.1 || b == set.1 {
+                if a == set.1 && b == set.1 {
+                    // nope
+                } else {
+                    valid_passwords += 1;
+                    //println!("{} {} {}", set.0, set.1, set.2)
+                }
+            }
+        }
+        println!("{}", valid_passwords)
+    }
+}
+