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use std::fs::File;
use std::io::prelude::*;
use std::io::BufReader;
fn main() -> Result<(), std::io::Error> {
let file = File::open("input.txt")?;
let reader = BufReader::new(&file);
let lines: Vec<_> = reader.lines().map(|x| x.unwrap()).collect::<Vec<String>>();
let mut bits: Vec<u32> = vec![0; lines[0].len()];
let half: u32 = (lines.len() / 2) as u32;
let mut gamma_string = String::new();
let mut epsilon_string = String::new();
for line in lines {
for (index, char) in line.chars().enumerate() {
bits[index] += char.to_digit(10).unwrap();
}
}
for bit in bits {
if bit >= half {
gamma_string.push('1');
epsilon_string.push('0');
} else {
gamma_string.push('0');
epsilon_string.push('1');
}
}
let gamma_rate = isize::from_str_radix(&gamma_string, 2).unwrap();
let epsilon_rate = isize::from_str_radix(&epsilon_string, 2).unwrap();
println!("{}", gamma_rate * epsilon_rate);
Ok(())
}
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