4fd800b3a8 2011-02-23 kinaba: #include <iostream> 4fd800b3a8 2011-02-23 kinaba: #include <sstream> 4fd800b3a8 2011-02-23 kinaba: #include <iomanip> 4fd800b3a8 2011-02-23 kinaba: #include <vector> 4fd800b3a8 2011-02-23 kinaba: #include <string> 4fd800b3a8 2011-02-23 kinaba: #include <map> 4fd800b3a8 2011-02-23 kinaba: #include <set> 4fd800b3a8 2011-02-23 kinaba: #include <algorithm> 4fd800b3a8 2011-02-23 kinaba: #include <numeric> 4fd800b3a8 2011-02-23 kinaba: #include <iterator> 4fd800b3a8 2011-02-23 kinaba: #include <functional> 4fd800b3a8 2011-02-23 kinaba: #include <complex> 4fd800b3a8 2011-02-23 kinaba: #include <queue> 4fd800b3a8 2011-02-23 kinaba: #include <stack> 4fd800b3a8 2011-02-23 kinaba: #include <cmath> 4fd800b3a8 2011-02-23 kinaba: #include <cassert> 4fd800b3a8 2011-02-23 kinaba: #include <cstring> 4fd800b3a8 2011-02-23 kinaba: using namespace std; 4fd800b3a8 2011-02-23 kinaba: typedef long long LL; 4fd800b3a8 2011-02-23 kinaba: typedef complex<double> CMP; 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: class StrangeCountry { public: 4fd800b3a8 2011-02-23 kinaba: int transform(vector <string> g) 4fd800b3a8 2011-02-23 kinaba: { 4fd800b3a8 2011-02-23 kinaba: int nConn=g.size(), nEdge=0; 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: vector<int> uf(g.size(), -1); // union_find 4fd800b3a8 2011-02-23 kinaba: for(int x=0; x<g.size(); ++x) 4fd800b3a8 2011-02-23 kinaba: { 4fd800b3a8 2011-02-23 kinaba: if( g[x].find('Y')==-1 ) 4fd800b3a8 2011-02-23 kinaba: return -1; // orphan 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: for(int y=x+1; y<g.size(); ++y) 4fd800b3a8 2011-02-23 kinaba: if( g[x][y]=='Y' ) { 4fd800b3a8 2011-02-23 kinaba: ++nEdge; 4fd800b3a8 2011-02-23 kinaba: int rx=x; while( uf[rx]>=0 ) rx=uf[rx]; 4fd800b3a8 2011-02-23 kinaba: int ry=y; while( uf[ry]>=0 ) ry=uf[ry]; 4fd800b3a8 2011-02-23 kinaba: if( rx != ry ) uf[rx]=ry, --nConn; 4fd800b3a8 2011-02-23 kinaba: } 4fd800b3a8 2011-02-23 kinaba: } 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: int redundant = nEdge - (g.size() - nConn); 4fd800b3a8 2011-02-23 kinaba: return redundant>=nConn-1 ? nConn-1 : -1; 4fd800b3a8 2011-02-23 kinaba: } 4fd800b3a8 2011-02-23 kinaba: }; 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: // BEGIN CUT HERE 4fd800b3a8 2011-02-23 kinaba: #include <ctime> 4fd800b3a8 2011-02-23 kinaba: double start_time; string timer() 4fd800b3a8 2011-02-23 kinaba: { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); } 4fd800b3a8 2011-02-23 kinaba: template<typename T> ostream& operator<<(ostream& os, const vector<T>& v) 4fd800b3a8 2011-02-23 kinaba: { os << "{ "; 4fd800b3a8 2011-02-23 kinaba: for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it) 4fd800b3a8 2011-02-23 kinaba: os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; } 4fd800b3a8 2011-02-23 kinaba: void verify_case(const int& Expected, const int& Received) { 4fd800b3a8 2011-02-23 kinaba: bool ok = (Expected == Received); 4fd800b3a8 2011-02-23 kinaba: if(ok) cerr << "PASSED" << timer() << endl; else { cerr << "FAILED" << timer() << endl; 4fd800b3a8 2011-02-23 kinaba: cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } } 4fd800b3a8 2011-02-23 kinaba: #define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock(); 4fd800b3a8 2011-02-23 kinaba: #define END verify_case(_, StrangeCountry().transform(g));} 4fd800b3a8 2011-02-23 kinaba: int main(){ 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: CASE(0) 4fd800b3a8 2011-02-23 kinaba: string g_[] = {"NY", 4fd800b3a8 2011-02-23 kinaba: "YN"}; 4fd800b3a8 2011-02-23 kinaba: vector <string> g(g_, g_+sizeof(g_)/sizeof(*g_)); 4fd800b3a8 2011-02-23 kinaba: int _ = 0; 4fd800b3a8 2011-02-23 kinaba: END 4fd800b3a8 2011-02-23 kinaba: CASE(1) 4fd800b3a8 2011-02-23 kinaba: string g_[] = {"NYYNN", 4fd800b3a8 2011-02-23 kinaba: "YNYNN", 4fd800b3a8 2011-02-23 kinaba: "YYNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNY", 4fd800b3a8 2011-02-23 kinaba: "NNNYN"}; 4fd800b3a8 2011-02-23 kinaba: vector <string> g(g_, g_+sizeof(g_)/sizeof(*g_)); 4fd800b3a8 2011-02-23 kinaba: int _ = 1; 4fd800b3a8 2011-02-23 kinaba: END 4fd800b3a8 2011-02-23 kinaba: CASE(2) 4fd800b3a8 2011-02-23 kinaba: string g_[] = {"NYYNNNN", 4fd800b3a8 2011-02-23 kinaba: "YNYNNNN", 4fd800b3a8 2011-02-23 kinaba: "YYNNNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNYYN", 4fd800b3a8 2011-02-23 kinaba: "NNNYNYY", 4fd800b3a8 2011-02-23 kinaba: "NNNYYNY", 4fd800b3a8 2011-02-23 kinaba: "NNNNYYN"}; 4fd800b3a8 2011-02-23 kinaba: vector <string> g(g_, g_+sizeof(g_)/sizeof(*g_)); 4fd800b3a8 2011-02-23 kinaba: int _ = 1; 4fd800b3a8 2011-02-23 kinaba: END 4fd800b3a8 2011-02-23 kinaba: CASE(3) 4fd800b3a8 2011-02-23 kinaba: string g_[] = {"NYNYNNNNNNNN", 4fd800b3a8 2011-02-23 kinaba: "YNYNNNNNNNNN", 4fd800b3a8 2011-02-23 kinaba: "NYNYYNNNNNNN", 4fd800b3a8 2011-02-23 kinaba: "YNYNNNNNNNNN", 4fd800b3a8 2011-02-23 kinaba: "NNYNNYYNNNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNYNYNNNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNYYNNNNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNNNNNYYNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNNNNYNYNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNNNNYYNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNNNNNNNNY", 4fd800b3a8 2011-02-23 kinaba: "NNNNNNNNNNYN"}; 4fd800b3a8 2011-02-23 kinaba: vector <string> g(g_, g_+sizeof(g_)/sizeof(*g_)); 4fd800b3a8 2011-02-23 kinaba: int _ = 2; 4fd800b3a8 2011-02-23 kinaba: END 4fd800b3a8 2011-02-23 kinaba: CASE(4) 4fd800b3a8 2011-02-23 kinaba: string g_[] = {"NYNNNN", 4fd800b3a8 2011-02-23 kinaba: "YNYNNN", 4fd800b3a8 2011-02-23 kinaba: "NYNYNN", 4fd800b3a8 2011-02-23 kinaba: "NNYNNN", 4fd800b3a8 2011-02-23 kinaba: "NNNNNY", 4fd800b3a8 2011-02-23 kinaba: "NNNNYN"}; 4fd800b3a8 2011-02-23 kinaba: vector <string> g(g_, g_+sizeof(g_)/sizeof(*g_)); 4fd800b3a8 2011-02-23 kinaba: int _ = -1; 4fd800b3a8 2011-02-23 kinaba: END 4fd800b3a8 2011-02-23 kinaba: 4fd800b3a8 2011-02-23 kinaba: } 4fd800b3a8 2011-02-23 kinaba: // END CUT HERE