day6

res/06/example

@@ -0,0 +1,2 @@
+Time:      7  15   30
+Distance:  9  40  200

res/06/input

@@ -0,0 +1,2 @@
+Time:        51     92     68     90
+Distance:   222   2031   1126   1225

src/days/d06.rs

@@ -0,0 +1,51 @@
+use std::fs;
+
+pub fn solve() {
+    let path = "res/06/input";
+
+    let contents = fs::read_to_string(path).expect("I/O error, wrong path?");
+    //let contents = BufReader::new(fs::File::open(path).expect("I/O error, wrong path?"));
+
+    let times: Vec<usize> = contents.lines().next().unwrap().split_whitespace().skip(1).map(|s| s.parse::<usize>().unwrap()).collect();
+    let records: Vec<usize> = contents.lines().skip(1).next().unwrap().split_whitespace().skip(1).map(|s| s.parse::<usize>().unwrap()).collect();
+
+    let distances: Vec<Vec<usize>> = times
+        .iter()
+        .map(|t| {
+            (0..*t).map(|load_t| {
+                    load_t * (t-load_t)
+                })
+                .collect::<Vec::<usize>>()
+        })
+        .collect();
+
+    let result: usize = distances.iter()
+        .enumerate()
+        .map(|(i, dist)| {
+            dist.iter()
+                .filter(|d| **d > records[i])
+                .count()
+        })
+        .product();
+
+    println!("Result 1: {}", result);
+
+    let act_time: usize = times.iter()
+        .map(|t| t.to_string())
+        .collect::<String>()
+        .parse()
+        .unwrap();
+    let act_record: usize = records.iter()
+        .map(|t| t.to_string())
+        .collect::<String>()
+        .parse()
+        .unwrap();
+
+    let result: usize = (0..act_time).map(|load_t| {
+            load_t * (act_time-load_t)
+        })
+        .filter(|d| *d > act_record)
+        .count();
+
+    println!("Result 2: {}", result);
+}

src/main.rs

@@ -1,7 +1,7 @@
 pub mod days;
 
 fn main() {
-    days::d05::solve()
+    days::d06::solve()
     //_all_days()
 }