AtCoder Beginner Contest 253 B

https://atcoder.jp/contests/abc253/tasks/abc253_b

enumerateはこのようにするんですね。

    for (i, s) in S.iter().enumerate() {
        ...
    }

// Distance Between Tokens
#![allow(non_snake_case)]


//////////////////// library ////////////////////

fn read<T: std::str::FromStr>() -> T {
    let mut line = String::new();
    std::io::stdin().read_line(&mut line).ok();
    line.trim().parse().ok().unwrap()
}

fn read_vec<T: std::str::FromStr>() -> Vec<T> {
    read::<String>().split_whitespace()
            .map(|e| e.parse().ok().unwrap()).collect()
}


//////////////////// process ////////////////////

fn get_points(S: &Vec<String>) -> Vec<(i32,i32)> {
    let mut v = Vec::<(i32,i32)>::new();
    for (i, s) in S.iter().enumerate() {
        for (j, c) in s.chars().enumerate() {
            if c == 'o' {
                v.push((i as i32, j as i32))
            }
        }
    }
    return v
}

fn main() {
    let v = read_vec();
    let H: usize = v[0];
    let S: Vec<String> = (0..H).map(|_| read()).collect();
    let points = get_points(&S);
    assert!(points.len() == 2);
    let (i1, j1) = points[0];
    let (i2, j2) = points[1];
    let d = (i1 - i2).abs() + (j1 - j2).abs();
    println!("{}", d)
}