DancingFoxes.cpp

#include <string>
#include <vector>
using namespace std;

// BEGIN CUT HERE
#include <iostream>
#include <sstream>
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v);
// END CUT HERE

vector<string> F;
int n;
vector<bool> V;

int BT( int p )
{
    V[p] = true;
    if ( p==1 )
        return 0;

    int ret = 9999;

    for ( int i=0; i<n; i++ )
        if ( F[p][i]=='Y' && !V[i] )
            ret = min( ret, BT(i)+1 );

    return ret;
}

class DancingFoxes{public:
int minimalDays( vector <string> friendship )
{
    F = friendship;
    n = (int)friendship.size();
    V = vector<bool>(n);

    int d = BT(0);

    if ( d==9999 )
        return -1;

    int ans = 0;
    int x = 1;
    while ( x<d )
    {
        x += (x+1)/2;
        ans++;
    }

    return ans;
}};

// BEGIN CUT HERE
#include <ctime>
double start_time; string timer()
 { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
 { os << "{ ";
   for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
   os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
void verify_case(const int& Expected, const int& Received) {
 bool ok = (Expected == Received);
 if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
 cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
#define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
#define END  verify_case(_, DancingFoxes().minimalDays(friendship));}
int main(){

CASE(0)
    string friendship_[] = {"NNY",
 "NNY",
 "YYN"};
      vector <string> friendship(friendship_, friendship_+sizeof(friendship_)/sizeof(*friendship_)); 
    int _ = 1; 
END
CASE(1)
    string friendship_[] = {"NNNNN",
 "NNYYY",
 "NYNYY",
 "NYYNY",
 "NYYYN"};
      vector <string> friendship(friendship_, friendship_+sizeof(friendship_)/sizeof(*friendship_)); 
    int _ = -1; 
END
CASE(2)
    string friendship_[] = {"NNYYNN",
 "NNNNYY",
 "YNNNYN",
 "YNNNNY",
 "NYYNNN",
 "NYNYNN"};
      vector <string> friendship(friendship_, friendship_+sizeof(friendship_)/sizeof(*friendship_)); 
    int _ = 2; 
END
CASE(3)
    string friendship_[] = {"NNYNNNNYN",
 "NNNNYNYNN",
 "YNNYNYNNN",
 "NNYNYNYYN",
 "NYNYNNNNY",
 "NNYNNNYNN",
 "NYNYNYNNN",
 "YNNYNNNNY",
 "NNNNYNNYN"};
      vector <string> friendship(friendship_, friendship_+sizeof(friendship_)/sizeof(*friendship_)); 
    int _ = 3; 
END
CASE(4)
    string friendship_[] = {"NY",
 "YN"};
      vector <string> friendship(friendship_, friendship_+sizeof(friendship_)/sizeof(*friendship_)); 
    int _ = 0; 
END

}
// END CUT HERE