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use core::cmp::{max, min};
use std::io::{BufRead};
pub fn read_helper<'a, 'b, R: BufRead>(r: &'a mut R, buf: &'b mut Vec<u8>, token: u8) -> std::io::Result<usize> {
buf.clear();
let num_bytes = r.read_until(token, buf)?;
if buf.last() == Some(& token) { buf.pop(); }
Ok(num_bytes)
}
pub fn is_galaxy(c: u8) -> bool {
c == b'#'
}
pub type Position = [usize; 2];
pub fn cumulative_sum_expansion(doubling: & [bool], factor: usize) -> Vec<usize> {
let mut ret: Vec<usize> = Vec::with_capacity(doubling.len());
let mut sum: usize = 0;
for &x in doubling.into_iter() {
if x {
sum += factor;
}
else {
sum += 1;
}
ret.push(sum);
}
ret
}
pub fn distance(cumul_rows: & [usize], cumul_cols: & [usize], p: & Position, q: & Position) -> usize {
(cumul_rows[max(p[0], q[0])] - cumul_rows[min(p[0], q[0])])
+ (cumul_cols[max(p[1], q[1])] - cumul_cols[min(p[1], q[1])])
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test() {
}
}
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