Add day 5, 6, 7

2023/day6/day6/.gitignore

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+/target

2023/day6/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 = "aho-corasick"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b2969dcb958b36655471fc61f7e416fa76033bdd4bfed0678d8fee1e2d07a1f0"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "day6"
+version = "0.1.0"
+dependencies = [
+ "regex",
+]
+
+[[package]]
+name = "memchr"
+version = "2.6.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f665ee40bc4a3c5590afb1e9677db74a508659dfd71e126420da8274909a0167"
+
+[[package]]
+name = "regex"
+version = "1.10.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "380b951a9c5e80ddfd6136919eef32310721aa4aacd4889a8d39124b026ab343"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5f804c7828047e88b2d32e2d7fe5a105da8ee3264f01902f796c8e067dc2483f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c08c74e62047bb2de4ff487b251e4a92e24f48745648451635cec7d591162d9f"

2023/day6/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]
+regex = "1.10.2"

2023/day6/day6/input.txt

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

2023/day6/day6/src/main.rs

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+use std::{
+    fs::File,
+    io::{BufRead, BufReader},
+};
+
+fn main() {
+    // Open the file
+    let file = File::open("input.txt").expect("Failed to open file");
+    let reader = BufReader::new(file);
+
+    let mut lines = reader.lines().map(|l| l.unwrap());
+
+    let line1 = lines.next().unwrap();
+    let line2 = lines.next().unwrap();
+
+    let times: Vec<i64> = line1.split(' ').filter_map(|s| s.parse().ok()).collect();
+
+    let distances: Vec<i64> = line2.split(' ').filter_map(|s| s.parse().ok()).collect();
+
+    println!("Part 1: {}", calc(times, distances));
+
+    println!("Part 2: {}", calc(vec![63789468], vec![411127420471035]));
+}
+
+fn calc(times: Vec<i64>, distances: Vec<i64>) -> i32 {
+    let mut out = 1;
+
+    for (&t, &d) in times.iter().zip(distances.iter()) {
+        let mut count = 0;
+
+        for speed in 1..t {
+            let total = (t - speed) * speed;
+
+            if total > d {
+                count += 1;
+            }
+        }
+
+        out *= count;
+    }
+
+    out
+}