MSProblem-1

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

#define int long long
#define inf 2e18
int MOD=1000000007;//998244353;
const int nn=1000050;
bool prime[nn]; //array to store precalculated primes till 10^6
void cal_primes(){memset(prime,true,sizeof(prime)); for(int i=2;i<=sqrt(nn);++i){ if(prime[i]==true){ for(int j=i*i;j<=nn;j+=i){prime[j]=false;}}}}

//testcases provided at the end

int n,m;
bool check(int x,int y)
{
    if((x>n-1)||(y>m-1)||(x<0)||(y<0))
        return false;
    return true;
}

void solve(int t)
{
    int testcases=t;
    while(t--)
    {
    //  cout<<"Case #"<<(testcases-t)<<": "<<endl;
        cin>>n>>m;   //number of rows and columns in the string matrix
        string s;
        vector<string>v;
        for(int i=0;i<n;i++)
        {
            cin>>s;
            v.push_back(s);
        }

        bool vis[n][m][4];
        for(int i=0;i<n;i++)
            for(int j=0;j<m;j++)
                for(int k=0;k<4;k++)
                    vis[i][j][k]=false;

        bool flag=true;
        int dir=0,x=0,y=0;
        while(flag)
        {
            if(vis[x][y][dir])
                flag=false;
            else
            {
                if((check(x,y))&&(v[x][y]=='.'))
                {
                    vis[x][y][dir]=true;;
                    if(dir==0)y++;
                    else if(dir==1)x++;
                    else if(dir==2)y--;
                    else x--;
                }
                else
                {
                    if(dir==0)y--;
                    else if(dir==1)x--;
                    else if(dir==2)y++;
                    else x++;

                    dir=(dir+1)%4;
                }
            }
        }

        int ans=0;
        for(int i=0;i<n;i++)
            for(int j=0;j<m;j++)
                if(vis[i][j][0]||vis[i][j][1]||vis[i][j][2]||vis[i][j][3])
                    ans++;

        cout<<ans<<endl;
    }
}

main()
{
    auto start=chrono::system_clock::now();
    {
        #ifndef ONLINE_JUDGE
            freopen("input.txt","r",stdin);
            freopen("output.txt","w",stdout);
            freopen("error.txt","w",stderr);
        #endif
        ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);
        int t=1;
    //  cin>>t;
        solve(t);
    }
    auto end=chrono::system_clock::now();
    chrono::duration<double> elapsed=end-start;
//  cout<<endl<<"Time taken: "<<elapsed.count()<<" sec";
    return 0;
}


/*

testcase 1:

4 5
...x.
.x..x
x...x
..x..

testcase 2:

4 7
....X..
X......
.....X.
.......

*/