Robotti

#include <iostream>
#include <bits/stdc++.h>
#include <algorithm>
#include <vector>

using namespace std;

long long n;

int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    cin >> n;
    
    vector<string> grid(n);

    for (int i = 0; i < n; i++)
    {
        cin >> grid[i];
    }

    long long x = 0, y = -1;

    long long dx = 0, dy = 1;

    long long steps = 0;

    while (true)
    {

        //cout << dy << dx << " ";
        //cout << " " << y << x << " ";
        x += dx;
        y += dy;



        if (x < 0 || x >= n || y < 0 || y >= n) break;
        steps++;
        
        if (grid[y][x] == '\\')
        {
            if (dy == 1) {dy = 0; dx = 1;}
            else if (dy == -1) {dy = 0; dx = -1;}
            else if (dx == 1) {dy = 1; dx = 0;}
            else if (dx == -1) {dy = -1; dx = 0;}

            grid[y][x] = '/';
        }   
        else if (grid[y][x] == '/')
        {
            if (dy == 1) {dy = 0; dx = -1;}
            else if (dy == -1) {dy = 0; dx = 1;}
            else if (dx == 1) {dy = -1; dx = 0;}
            else if (dx == -1) {dy = 1; dx = 0;}
            
            grid[y][x] = '\\';

        }
        

    }

    cout << steps;

    return 0;
}

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