Robotti

#include<bits/stdc++.h>

typedef long long ll;
using namespace std;

char c[21][21];
int n, k = 0;
int d = -2;

void haku(int x, int y){
    if (x == n && y == n+1) return;
    //cout << x << " " << y << " " << d << "\n";
    k++;
    if (c[y][x] == '\\'){
        c[y][x] = '/';
        if (d == -2){
            d = 1;
            haku(x+1,y);
        }
        else if (d == 2){
            d = -1;
            haku(x-1,y);
        }
        else if (d == 1){
            d = -2;
            haku(x,y+1);
        }
        else if (d == -1){
            d = 2;
            haku(x,y-1);
        }
    }
    else if (c[y][x] == '/'){
        c[y][x] = '\\';
        if (d == -2){
            d = -1;
            haku(x-1,y);
        }
        else if (d == 2){
            d = 1;
            haku(x+1,y);
        }
        else if (d == 1){
            d = 2;
            haku(x,y-1);
        }
        else if (d == -1){
            d = -2;
            haku(x,y+1);
        }
    }
    else if (c[y][x] == '.'){
        if (d == -2)haku(x,y+1);
        else if (d == 2) haku(x,y-1);
        else if (d == 1) haku(x+1,y);
        else if (d == -1) haku(x-1,y);
    }
}

int main(){
    cin >> n;
    for (int i = 1; i <= n; i++){
        for (int j = 1; j <= n; j++){
            cin >> c[i][j];
        }
    }
    haku(1,1);
    cout << k << "\n";
}

Test 1 (public)

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER