Robotti

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

using namespace std;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);
    int n;
    int l=1;
    cin >> n;
    int x=0,y=0,dx=0,dy=1;
    vector<string> v;
    for (int i = 0; i < n; i++)
    {
        string s;
        cin >> s;
        v.push_back(s);
    }
    int nx = 0; // (nx >= 0 && nx < n)&&(ny >= 0 && ny < n)
    int ny = 0;
    while(l < 13) { 
        nx = x+dx;
        ny = y+dy;


        if (v[ny][nx] == '/') {
            if (dx == 1) {
                dy = -1;
                dx = 0;
            }else if (dx == -1){
                dy = 1;
                dx = 0;
            }else if (dy == 1){
                dy = 0;
                dx = -1;
            }else if (dy == -1){
                dy = 0;
                dx = 1;
            }
        }

        if (v[ny][nx] == '\\') {

            if (dx == 1) {
                dy = +1;
                dx = 0;
            }else if (dx == -1){
                dy = -1;
                dx = 0;
            }else if (dy == 1){
                dy = 0;
                dx = 1;
            }else if (dy == -1){
                dy = 0;
                dx = -1;
            }
        }
        l++;

        if (ny+dy < 0 || ny+dy >= n || nx+dx < 0 || nx+dx >= n) {
            break;
        }


        v[y][x] = (v[y][x] == '/') ? '\\' : (v[y][x] == '\\') ? '/' : '.';

        x = nx;
        y = ny;


    }


    cout << l;
    

    return 0;
}

Test 1 (public)

Verdict: ACCEPTED

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER