2023-06: Implement part one

2023/06-wait-for-it/Cargo.toml

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

2023/06-wait-for-it/input.txt

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+Time:        51     92     68     90
+Distance:   222   2031   1126   1225

2023/06-wait-for-it/input_test.txt

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+Time:      7  15   30
+Distance:  9  40  200

2023/06-wait-for-it/src/main.rs

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+mod part_one;
+
+fn main() {
+    part_one::part_one();
+}

2023/06-wait-for-it/src/part_one.rs

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+use std::fs::File;
+use std::io::{self, BufRead};
+use std::path::Path;
+
+pub fn part_one() {
+    if let Ok(lines) = read_lines("./input.txt") {
+        let mut margin = 1;
+
+        let mut race_results: Vec<Vec<u32>> = Vec::new();
+
+        for line in lines {
+            race_results.push(process_line(&line.unwrap()));
+        }
+
+        for i in 0..race_results[0].len() {
+            margin *= process_race_result(race_results[0][i], race_results[1][i]);
+        }
+        
+        println!("{:?}", margin);
+    }
+}
+
+fn process_line(s: &str) -> Vec<u32> {
+    
+    let nums_str = s.split(':').collect::<Vec<&str>>()[1].split_whitespace().collect::<Vec<&str>>();
+    let nums: Vec<u32> = nums_str.iter().map(|s| s.parse::<u32>().unwrap()).collect();
+
+    return nums;    
+}
+
+fn process_race_result(time: u32, distance: u32) -> u32 {
+    
+    let mut win_count = 0;
+
+    for i in 0..time {
+        if i * (time - i) > distance {
+            win_count += 1;
+        }
+    }
+
+    return win_count;
+}
+
+
+fn read_lines<P>(filename: P) -> io::Result<io::Lines<io::BufReader<File>>>
+where
+    P: AsRef<Path>,
+{
+    let file = File::open(filename)?;
+    Ok(io::BufReader::new(file).lines())
+}