55 lines
2.0 KiB
Rust
55 lines
2.0 KiB
Rust
use std::fs::File;
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use std::io::{self, BufRead, BufReader};
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fn parse_input(file_path: &str) -> io::Result<(i64, i64)> {
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let file = File::open(file_path)?;
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let reader = BufReader::new(file);
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let mut lines = reader.lines();
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let time_line = lines.next().ok_or(io::Error::new(io::ErrorKind::Other, "Missing time line"))??;
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let distance_line = lines.next().ok_or(io::Error::new(io::ErrorKind::Other, "Missing distance line"))??;
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let time = time_line.chars().filter(|c| c.is_digit(10)).collect::<String>().parse::<i64>().unwrap_or(0);
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let distance = distance_line.chars().filter(|c| c.is_digit(10)).collect::<String>().parse::<i64>().unwrap_or(0);
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Ok((time, distance))
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}
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fn calculate_winning_ways(time: i64, record: i64) -> i64 {
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let mut min_hold_time = 0;
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while min_hold_time * (time - min_hold_time) <= record && min_hold_time < time {
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min_hold_time += 1;
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}
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let mut max_hold_time = time - 1;
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while max_hold_time * (time - max_hold_time) <= record && max_hold_time >= 0 {
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max_hold_time -= 1;
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}
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std::cmp::max(0, max_hold_time - min_hold_time + 1)
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}
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fn run_test(file_path: &str, expected_result: i64) -> io::Result<()> {
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let (time, distance) = parse_input(file_path)?;
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let result = calculate_winning_ways(time, distance);
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assert_eq!(result, expected_result, "Test failed! Expected {}, got {}", expected_result, result);
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println!("Test passed successfully.");
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Ok(())
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}
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fn main() {
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let test_file_path = "../test.txt";
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let expected_test_result = 71503; // Expected result from the test file
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if let Err(e) = run_test(test_file_path, expected_test_result) {
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eprintln!("An error occurred during test: {}", e);
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return;
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}
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let input_file_path = "../input.txt";
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match parse_input(input_file_path) {
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Ok((time, distance)) => {
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let result = calculate_winning_ways(time, distance);
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println!("Final result from input file: {}", result);
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}
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Err(e) => eprintln!("An error occurred while processing input file: {}", e),
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}
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}
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