Robotti

#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
const int N=30;

char g[N][N];
int n;

void input(){
    cin>>n;
    for(int i=1;i<=n;++i)
        for(int j=1;j<=n;++j)
            cin>>g[i][j];
}

void solve(){
    int ans=0;
    int x=1,y=1;
    int dx=1,dy=0;
    while(true){
        ++ans;
        if(g[x][y]=='/'){
            g[x][y]='\\';
            if(dx==1){
                dx=0;dy=-1;
            }
            else if(dx==-1){
                dx=0;dy=1;
            }
            else if(dy==1){
                dx=-1;dy=0;
            }
            else if(dy==-1){
                dx=1;dy=0;
            }
        }
        else if(g[x][y]=='\\'){
            g[x][y]='/';
            if(dx==1){
                dx=0;dy=1;
            }
            else if(dx==-1){
                dx=0;dy=-1;
            }
            else if(dy==1){
                dx=1;dy=0;
            }
            else if(dy==-1){
                dx=-1;dy=0;
            }
        }
        x+=dx;
        y+=dy;
        if(x<1||y<1||x>n||y>n)break;
    }
    cout<<ans<<endl;
}


int main(){
    input();
    solve();
    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