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pub type Grid = Vec<Vec<char>>;
fn read_rows() -> Vec<Vec<char>> {
let mut rows = Vec::<Vec::<char>>::new();
let mut line = String::new();
loop {
let mut row = Vec::<char>::new();
std::io::stdin().read_line(&mut line).unwrap();
let line_chars = line.as_bytes();
if line_chars[1] == '1' as u8 {
let _ = std::io::stdin().read_line(&mut line);
break;
}
let mut i = 0;
while i < line_chars.len() {
row.push(line_chars[i+1] as char);
i += 4;
}
rows.push(row);
line.clear();
}
rows
}
fn rows_to_grid(rows: &Vec<Vec<char>>) -> Grid {
let mut grid = vec![Vec::<char>::new(); rows[0].len()];
for row in rows.iter().rev() {
for i in 0..row.len() {
if row[i] != ' ' {
grid[i].push(row[i]);
}
}
}
grid
}
fn next_usize(line: &str, s: usize) -> (usize, usize) {
let i = line[s..].find(|c: char| c.is_digit(10)).unwrap() + s;
let j = line[i..].find(|c: char| c.is_whitespace()).unwrap() + i;
(line[i..j].parse::<usize>().unwrap(), j)
}
pub fn read_move(line: &str) -> (usize, usize, usize) {
let (n, i) = next_usize(line, 0);
let (from, i) = next_usize(line, i);
let (to, _) = next_usize(line, i);
(n, from, to)
}
pub fn get_grid_from_stdin() -> Grid {
rows_to_grid(&read_rows())
}
pub fn apply_moves_from_stdin<F: Fn(&mut Grid, &str) -> ()>(grid: &mut Grid, apply_move: F) {
let mut line = String::new();
while std::io::stdin().read_line(&mut line).unwrap() > 0 {
apply_move(grid, &line);
line.clear();
}
}
pub fn print_top(grid: &Grid) {
for column in grid {
let c = match column.last() { Some(d) => d, None => &'_' };
print!("{}", c);
}
println!();
}
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