#include <iostream>
#include <sstream>
#include <iomanip>
#include <vector>
#include <string>
#include <map>
#include <set>
#include <algorithm>
#include <numeric>
#include <iterator>
#include <functional>
#include <complex>
#include <queue>
#include <stack>
#include <cmath>
#include <cassert>
#include <cstring>
using namespace std;
typedef long long LL;
typedef complex<double> CMP;

class NetworkSecurity { public:
	int secureNetwork(vector <string> clientCable, vector <string> serverCable) 
	{
		int N = clientCable.size();
		int M = serverCable[0].size();

		vector< vector<int> > cd(N, vector<int>(N));
		for(int i=0; i<N; ++i)
			for(int j=0; j<N; ++j)
				if( clientCable[i][j]=='Y' )
					cd[i][j] = 1;
		for(int k=0; k<N; ++k)
			for(int i=0; i<N; ++i)
				for(int j=0; j<N; ++j)
					cd[i][j] |= cd[i][k] & cd[k][j];

		int cnt = 0;
		for(int i=0; i<N; ++i)
			for(int j=0; j<M; ++j)
			{
				if( serverCable[i][j]=='Y' )
				{
					for(int k=0; k<N; ++k)
						if( cd[i][k]==1 && serverCable[k][j]=='Y' )
							goto next;
					++cnt;
				next:;
				}
			}
		return cnt;
	}
};



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