Rust:
fn create_spiral(diameter: usize) -> Vec<Vec<usize>> { let move_pos = |pos: [isize; 2], direction: [isize; 2]| [ pos[0] + direction[0], pos[1] + direction[1], ]; let mut result = vec![vec![0; diameter]; diameter]; let mut pos = [0, 0]; let directions = [ [1, 0], [0, 1], [-1, 0], [0, -1] ]; let mut direction = 0; for i in 1..=diameter.pow(2) { result[pos[1] as usize][pos[0] as usize] = i; let new_pos = move_pos(pos, directions[direction]); let should_turn = new_pos[0] < 0 || new_pos[1] < 0 || diameter <= new_pos[0] as usize || diameter <= new_pos[1] as usize || result[new_pos[1] as usize][new_pos[0] as usize] != 0; if should_turn { direction = (direction + 1) % directions.len(); pos = move_pos(pos, directions[direction]); } else { pos = new_pos; } } result } fn main() { for row in create_spiral(10) { for cell in row { print!("{:4}", cell); } println!(); } }
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Rust: