day6 part1

day6/Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "day6"
+version = "0.1.0"

day6/Cargo.toml

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+[package]
+name = "day6"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

day6/input.txt

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+Time:        63     78     94     68
+Distance:   411   1274   2047   1035

day6/src/main.rs

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+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);
+}