ALDS 1_11_A Graph by Rust

4
1 2 2 4
2 1 4
3 0
4 1 3

0 1 0 1
0 0 0 1
0 0 0 0
0 0 1 0

use std::io;

fn read<T: std::str::FromStr>() -> Vec<T> {
    let mut buf = String::new();
    io::stdin().read_line(&mut buf).unwrap();
    buf.trim().split(' ').flat_map(str::parse).collect()
}

fn main() {
    let n = read::<usize>()[0];
    let mut graph_mat = vec![ vec![0;n] ;n];
    for i in 0..n {
        // u k v v v...
        let inputs = read::<usize>();
        let u = inputs[0] - 1;
        let k = inputs[1];
        if inputs.len() > 2 {
            for v in inputs[2..].into_iter() {
                graph_mat[u][v-1] = 1;
            }
        } 
    }

    for i in 0..n {
        for j in 0..n {
            if j > 0 { print!(" ");}
            print!("{}", graph_mat[i][j]);
        }
        println!("");
    }
}