Robotti

#include <bits/stdc++.h>
using namespace std;
char g[20][20];
int di[4] = {1, 0, -1, 0}; // SENW
int dj[4] = {0, 1, 0, -1};
void $() {
    int n;
    cin >> n;
    for (int i=0; i<n; i++) {
        for (int j=0; j<n; j++) {
            cin >> g[i][j];
        }
    }
    int ans = 0;
    int i = -1;
    int j = 0;
    int dir = 0;

    while (true) {
        i += di[dir];
        j += dj[dir];
        if (!(i>=0 && i<n && j>=0 && j<n)) break;
        ans++;
        if (g[i][j]=='.') continue;
        if (g[i][j]=='/') {
            if      (dir==0) dir = 3;
            else if (dir==1) dir = 2;
            else if (dir==2) dir = 1;
            else if (dir==3) dir = 0;
            g[i][j] = '\\';
        } else {
            if      (dir==0) dir = 1;
            else if (dir==1) dir = 0;
            else if (dir==2) dir = 3;
            else if (dir==3) dir = 2;
            g[i][j] = '/';
        }
    }
    cout << ans << '\n';
}
int main() {
    cin.tie(0)->sync_with_stdio(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