day6 part1

day6/src/main.rs

@@ -0,0 +1,30 @@
+use std::fs;
+
+fn main() {
+    let input = fs::read_to_string("input.txt").unwrap();
+    let input: Vec<_> = input.split('\n') // Seperate the Time and Distance lines
+    .map(|line| {
+        &line[line.find(':').unwrap() + 1..] // Drop "Time:" and "Distance:"
+    }).map(|line| {
+        line.split_whitespace() // Split the numbers into their own elements.
+        .map(|num| num.parse::<i32>().expect("Couldn't parse number")) // Parse numbers into i32
+        .collect::<Vec<_>>()
+    }).collect(); // collect into Vec
+
+    let mut valid_total = 1;
+
+    for round in 0..input.first().unwrap().len() {
+        let time = input[0][round];
+        let dist = input[1][round];
+        let mut valid = 0;
+
+        for remaining_time in 0..time {
+            if (time - remaining_time) * remaining_time > dist {
+                valid += 1;
+            }
+        }
+        valid_total *= valid;
+    }
+
+    println!("{}", valid_total);
+}