Robotti

use std::io;

fn main() {
    let mut input: String = String::new();
    io::stdin().read_line(&mut input).expect("gg");
    let n: usize = input.trim().parse().unwrap();
    let mut map: Vec<Vec<usize>> = vec![vec![0; n]; n];

    for i in 0..n {
        let mut input: String = String::new();
        io::stdin().read_line(&mut input).expect("gg");
        for (j, c) in input.chars().enumerate() {
            if c == '/' {
                map[j][i] = 1;
            } else if c == '\\' {
                map[j][i] = 2;
            }
        }
    }
    let mut steps: usize = 0;
    let mut coords: (i32, i32) = (0, 0);
    let mut dir: (i32, i32) = (0, 1);
    loop {
        steps += 1;
        if map[coords.0 as usize][coords.1 as usize] == 1 {
            if dir.0 == 1 {
                dir.0 = 0;
                dir.1 = -1;
            } else if dir.0 == -1 {
                dir.0 = 0;
                dir.1 = 1;
            } else if dir.1 == 1 {
                dir.1 = 0;
                dir.0 = -1;
            } else if dir.1 == -1 {
                dir.1 = 0;
                dir.0 = 1;
            }
            map[coords.0 as usize][coords.1 as usize] = 2;
        } else if map[coords.0 as usize][coords.1 as usize] == 2 {
            if dir.0 == 1 {
                dir.0 = 0;
                dir.1 = 1;
            } else if dir.0 == -1 {
                dir.0 = 0;
                dir.1 = -1;
            } else if dir.1 == 1 {
                dir.1 = 0;
                dir.0 = 1;
            } else if dir.1 == -1 {
                dir.1 = 0;
                dir.0 = -1;
            }
            map[coords.0 as usize][coords.1 as usize] = 1;
        }
        coords.1 += dir.1;
        coords.0 += dir.0;
        if (coords.0 > n as i32 - 1 || coords.0 < 0) || (coords.1 > n as i32 - 1 || coords.1 < 0) {
            break;
        }
    }
    println!("{}", steps);
}

Test 1 (public)

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED