Robotti

#include <bits/stdc++.h>

using namespace std;

struct Dir{
    int x;
    int y;
};

struct Pos{
    int x;
    int y;
};

Dir chooseDir(char obstacle, Dir dir){
    if (obstacle=='.'){
        return dir;
    }
    if (obstacle=='/'){
        if (dir.x==1){
            return {0, 1};
        }
        if (dir.x==-1){
            return {0, -1};
        }
        if (dir.y==1){
            return {1, 0};
        }
        if (dir.y==-1){
            return {-1, 0};
        }
    }
    if (obstacle=='\\'){
        if (dir.x==-1){
            return {0, 1};
        }
        if (dir.x==1){
            return {0, -1};
        }
        if (dir.y==-1){
            return {1, 0};
        }
        if (dir.y==1){
            return {-1, 0};
        }
    }
    return {0 ,0};
}
int main(){
    int n;
    cin>>n;
    vector<string> grid(n);
    for (int i=0;i<n;i++){
        string s;
        cin>>s;
        grid[n-1-i]=s;
    }

    Pos pos={0, n-1};
    Dir dir={0, -1};

    int step=0;
    while (true){
        //cout<<"pos: "<<pos.x+1<<" "<<pos.y+1<<"\n";
        dir = chooseDir(grid[pos.y][pos.x], dir);
        if (grid[pos.y][pos.x]=='/'){
            grid[pos.y][pos.x]='\\';
        }
        if (grid[pos.y][pos.x]=='\\'){
            grid[pos.y][pos.x]='/';
        }
        //cout<<"dir: "<<dir.x<<" "<<dir.y<<" "<<grid[pos.y][pos.x]<<"\n";

        if (pos.x+dir.x>n-1 || pos.x+dir.x<0 || pos.y+dir.y>n-1 || pos.y+dir.y<0){
            cout<<step<<"\n";
            return step+1;
        }
        pos={pos.x+dir.x, pos.y+dir.y};
        step++;

    }


    return 1;
}

Test 1 (public)

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR