This is my program:

#include<iostream.h>

int **a;

int main()
{
    int n,i,j,f=0;
    char c;
    cin >> n; cin.get(c);
    a=new int* [n+2];
    a[0]=new int [n+2];
    a[n+1]=new int [n+2];
    for (i=1; i<=n; i++)
    {
        a[i]=new int [n+2];
        for (j=1; j<=n; j++)
        {
            cin.get(c);
            while ((c!='.')&&(c!='#'))
                cin.get(c);
            if (c=='.') a[i][j]=0;
            else a[i][j]=1;
        }
        cin.get(c);
    }
    for (i=0; i<=n+1; i++)
    {
        a[0][i]=1; a[n+1][i]=1;
        a[i][0]=1; a[i][n+1]=1;
    }
    int state=1;
    long len=-3;
    i=1; j=1;
    while ((i!=1)||(j!=1)||(state!=4))
    {
        if ((i==n)&&(j==n)) f=1;
        if (state==1)
        {
            if (a[i-1][j])
            {
                len++;
                if (a[i][j+1]) state=2;
                else j++;
            } else {state=4; i--;}
        } else
        if (state==2)
        {
            if (a[i][j+1])
            {
                len++;
                if (a[i+1][j]) state=3;
                else i++;
            } else {state=1; j++;}
        } else
        if (state==3)
        {
            if (a[i+1][j])
            {
                len++;
                if (a[i][j-1]) state=4;
                else j--;
            } else {state=2; i++;}
        } else
        {
            if (a[i][j-1])
            {
                len++;
                if (a[i-1][j]) state=1;
                else i--;
            } else {state=3; j--;}
        }
    }
    if (!f)
    {
        i=n; j=n; state=3; len++;
    while ((i!=n)||(j!=n)||(state!=2))
    {
        if ((i==n)&&(j==n)) f=1;
        if (state==1)
        {
            if (a[i-1][j])
            {
                len++;
                if (a[i][j+1]) state=2;
                else j++;
            } else {state=4; i--;}
        } else
        if (state==2)
        {
            if (a[i][j+1])
            {
                len++;
                if (a[i+1][j]) state=3;
                else i++;
            } else {state=1; j++;}
        } else
        if (state==3)
        {
            if (a[i+1][j])
            {
                len++;
                if (a[i][j-1]) state=4;
                else j--;
            } else {state=2; i++;}
        } else
        {
            if (a[i][j-1])
            {
                len++;
                if (a[i-1][j]) state=1;
                else i--;
            } else {state=3; j--;}
        }
    }
    }
    cout << 9*len;
    return 0;
}

I check my program on all tests on forum, it works right!
If somebody can help me, show me my mistake, please.
Beforehand thanks.