Pereti

#include <bits/stdc++.h>

using namespace std;

int a[105][105], b[105][105], n, m;

void Citire()
{
    ifstream fin("pereti.in");
    fin >> n >> m;
    for (int i = 1; i <= n; i++)
        for (int j = 1; j <= m; j++)
            fin >> a[i][j];
    fin.close();
}

inline int Interior(int i, int j)
{
    if (i < 0 || i > n + 1) return 0;
    if (j < 0 || j > m + 1) return 0;
    return 1;
}

void Fill(int i, int j)
{
    b[i][j] = 1;
    if (Interior(i - 1, j) && b[i - 1][j] == 0 && ((a[i][j] & 8) == 0))
        Fill(i - 1, j);
    if (Interior(i + 1, j) && b[i + 1][j] == 0 && ((a[i][j] & 2) == 0))
        Fill(i + 1, j);
    if (Interior(i, j + 1) && b[i][j + 1] == 0 && ((a[i][j] & 4) == 0))
        Fill(i, j + 1);
    if (Interior(i, j - 1) && b[i][j - 1] == 0 && ((a[i][j] & 1) == 0))
        Fill(i, j - 1);
}

void Bordare()
{
    int i, j;
    /// linia 0:
    for (j = 1; j <= m; j++)
        if ((a[1][j] & 8) != 0) a[0][j] = 2;
    /// linia n + 1
    for (j = 1; j <= m; j++)
        if ((a[n][j] & 2) != 0) a[n + 1][j] = 8;
    /// coloana 0
    for (i = 1; i <= n; i++)
        if ((a[i][1] & 1) != 0) a[i][0] = 4;
    for (i = 1; i <= n; i++)
        if ((a[i][m] & 4) != 0) a[i][m + 1] = 1;
}

void Rezolva()
{
    int i, j, cnt = 0;
    Fill(0, 0);
    for (i = 0; i <= n + 1; i++)
        for (j = 0; j <= m + 1; j++)
            if (b[i][j] == 1)
            {
                if ((a[i][j] & 8) != 0) cnt++;
                if ((a[i][j] & 4) != 0) cnt++;
                if ((a[i][j] & 2) != 0) cnt++;
                if ((a[i][j] & 1) != 0) cnt++;
            }
    ofstream fout("pereti.out");
    fout << cnt << "\n";
    fout.close();
}

int main()
{
    Citire();
    Bordare();
    Rezolva();
    return 0;
}