day02

res/02/example

@@ -0,0 +1,6 @@
+7 6 4 2 1
+1 2 7 8 9
+9 7 6 2 1
+1 3 2 4 5
+8 6 4 4 1
+1 3 6 7 9

src/days/d02.rs

@@ -0,0 +1,78 @@
+use std::fs;
+
+pub fn solve() {
+    let path = "res/02/input";
+
+    let contents = fs::read_to_string(path).expect("Something went wrong reading the file");
+
+    let reports = contents
+        .lines()
+        .map(|line| {
+            line.split(" ")
+                .map(|n| n.parse::<usize>().unwrap())
+                .collect::<Vec<usize>>()
+        })
+        .collect::<Vec<Vec<usize>>>();
+
+    let result = reports
+        .iter()
+        .filter(|r| {
+            let mut curr = r[0];
+            if r[1] > curr {
+                for i in 1..r.len() {
+                    if r[i] > curr && curr.abs_diff(r[i]) < 4 {
+                        curr = r[i];
+                    } else {
+                        return false;
+                    }
+                }
+            } else {
+                for i in 1..r.len() {
+                    if r[i] < curr && curr.abs_diff(r[i]) < 4 {
+                        curr = r[i];
+                    } else {
+                        return false;
+                    }
+                }
+            }
+            true
+        })
+        .count();
+
+    println!("Result 1: {}", result);
+
+    let result = reports
+        .iter()
+        .filter(|r| {
+            if safe(r.clone().to_vec(), false) {
+                return true;
+            }
+            let mut r2 = r.clone().to_vec();
+            r2.remove(0);
+            if safe(r2, true) {
+                return true;
+            }
+            let mut r3 = r.clone().to_vec();
+            r3.remove(1);
+            safe(r3, true)
+        })
+        .count();
+
+    println!("Result 2: {}", result);
+}
+
+fn safe(report: Vec<usize>, dampener_used: bool) -> bool {
+    let mut dampener_used = dampener_used;
+    let dir: isize = if report[1] > report[0] { 1 } else { -1 };
+    let mut curr = report[0];
+    for i in 1..report.len() {
+        if report[i] as isize * dir > curr as isize * dir && curr.abs_diff(report[i]) < 4 {
+            curr = report[i];
+        } else if !dampener_used {
+            dampener_used = true;
+        } else {
+            return false;
+        }
+    }
+    true
+}

src/main.rs

@@ -4,7 +4,7 @@ extern crate scan_fmt;
 use std::time::Instant;
 
 fn main() {
-    days::d01::solve()
+    days::d02::solve()
     //_all_days()
 }
 
@@ -17,11 +17,10 @@ fn _all_days() {
     days::d01::solve();
     time = _print_elapsed(time);
 
-    /*
     println!("\nDay 2");
     days::d02::solve();
     time = _print_elapsed(time);
-
+    /*
     println!("\nDay 3");
     days::d03::solve();
     time = _print_elapsed(time);