8166493378 2012-05-12        kinaba: #include <iostream>
8166493378 2012-05-12        kinaba: #include <sstream>
8166493378 2012-05-12        kinaba: #include <iomanip>
8166493378 2012-05-12        kinaba: #include <vector>
8166493378 2012-05-12        kinaba: #include <string>
8166493378 2012-05-12        kinaba: #include <map>
8166493378 2012-05-12        kinaba: #include <set>
8166493378 2012-05-12        kinaba: #include <algorithm>
8166493378 2012-05-12        kinaba: #include <numeric>
8166493378 2012-05-12        kinaba: #include <iterator>
8166493378 2012-05-12        kinaba: #include <functional>
8166493378 2012-05-12        kinaba: #include <complex>
8166493378 2012-05-12        kinaba: #include <queue>
8166493378 2012-05-12        kinaba: #include <stack>
8166493378 2012-05-12        kinaba: #include <cmath>
8166493378 2012-05-12        kinaba: #include <cassert>
8166493378 2012-05-12        kinaba: #include <cstring>
8166493378 2012-05-12        kinaba: #ifdef __GNUC__
8166493378 2012-05-12        kinaba: #include <ext/hash_map>
8166493378 2012-05-12        kinaba: #define unordered_map __gnu_cxx::hash_map
8166493378 2012-05-12        kinaba: #else
8166493378 2012-05-12        kinaba: #include <unordered_map>
8166493378 2012-05-12        kinaba: #endif
8166493378 2012-05-12        kinaba: using namespace std;
8166493378 2012-05-12        kinaba: typedef long long LL;
8166493378 2012-05-12        kinaba: typedef complex<double> CMP;
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: class AntsMeet { public:
8166493378 2012-05-12        kinaba: 	int countAnts(vector <int> x, vector <int> y, string direction)
8166493378 2012-05-12        kinaba: 	{
8166493378 2012-05-12        kinaba: 		const int N = x.size();
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 		map< int, vector< pair<int,int> > > bye;
8166493378 2012-05-12        kinaba: 		for(int i=0; i<N; ++i)
8166493378 2012-05-12        kinaba: 			for(int j=i+1; j<N; ++j) {
8166493378 2012-05-12        kinaba: 				int t;
8166493378 2012-05-12        kinaba: 				if( meet(x[i], y[i], direction[i], x[j], y[j], direction[j], &t) )
8166493378 2012-05-12        kinaba: 					bye[t].push_back(make_pair(i,j));
8166493378 2012-05-12        kinaba: 			}
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 		set<int> dead;
8166493378 2012-05-12        kinaba: 		for(map<int, vector< pair<int,int> > >::iterator it=bye.begin(); it!=bye.end(); ++it) {
8166493378 2012-05-12        kinaba: 			set<int> die;
8166493378 2012-05-12        kinaba: 			vector< pair<int,int> >& events = it->second;
8166493378 2012-05-12        kinaba: 			for(int i=0; i<events.size(); ++i) {
8166493378 2012-05-12        kinaba: 				int a = events[i].first;
8166493378 2012-05-12        kinaba: 				int b = events[i].second;
8166493378 2012-05-12        kinaba: 				if( dead.count(a)==0 && dead.count(b)==0 ) {
8166493378 2012-05-12        kinaba: 					die.insert(a);
8166493378 2012-05-12        kinaba: 					die.insert(b);
8166493378 2012-05-12        kinaba: //					dead.insert(a);
8166493378 2012-05-12        kinaba: 	//				dead.insert(b);
8166493378 2012-05-12        kinaba: 				}
8166493378 2012-05-12        kinaba: 			}
8166493378 2012-05-12        kinaba: 			dead.insert(die.begin(), die.end());
8166493378 2012-05-12        kinaba: 		}
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 		return N - dead.size();
8166493378 2012-05-12        kinaba: 	}
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 	bool meet(int x, int y, char d, int X, int Y, int D, int* t)
8166493378 2012-05-12        kinaba: 	{
8166493378 2012-05-12        kinaba: 		if( d == D )
8166493378 2012-05-12        kinaba: 			return false;
8166493378 2012-05-12        kinaba: 		int dx = dx_of(d);
8166493378 2012-05-12        kinaba: 		int dy = dy_of(d);
8166493378 2012-05-12        kinaba: 		int DX = dx_of(D);
8166493378 2012-05-12        kinaba: 		int DY = dy_of(D);
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 		int tx;
8166493378 2012-05-12        kinaba: 		if( !meet(x, dx, X, DX, &tx) )
8166493378 2012-05-12        kinaba: 			return false;
8166493378 2012-05-12        kinaba: 		int ty;
8166493378 2012-05-12        kinaba: 		if( !meet(y, dy, Y, DY, &ty) )
8166493378 2012-05-12        kinaba: 			return false;
8166493378 2012-05-12        kinaba: 		*t = (tx==-1 ? ty : tx);
8166493378 2012-05-12        kinaba: 		return (tx==ty || tx==-1 || ty==-1);
8166493378 2012-05-12        kinaba: 	}
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 	bool meet(int x, int dx, int X, int DX, int* t)
8166493378 2012-05-12        kinaba: 	{
8166493378 2012-05-12        kinaba: 		if( x==X && dx==DX ) {
8166493378 2012-05-12        kinaba: 			*t = -1;
8166493378 2012-05-12        kinaba: 			return true;
8166493378 2012-05-12        kinaba: 		} else if( dx==DX ) {
8166493378 2012-05-12        kinaba: 			return false;
8166493378 2012-05-12        kinaba: 		} else {
8166493378 2012-05-12        kinaba: 			*t = (x-X)*2 / (DX-dx);
8166493378 2012-05-12        kinaba: 			return ( *t >= 0 );
8166493378 2012-05-12        kinaba: 		}
8166493378 2012-05-12        kinaba: 	}
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 	int dx_of(char d)
8166493378 2012-05-12        kinaba: 	{
8166493378 2012-05-12        kinaba: 		if(d=='E') return +1;
8166493378 2012-05-12        kinaba: 		if(d=='W') return -1;
8166493378 2012-05-12        kinaba: 		return 0;
8166493378 2012-05-12        kinaba: 	}
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: 	int dy_of(char d)
8166493378 2012-05-12        kinaba: 	{
8166493378 2012-05-12        kinaba: 		if(d=='N') return +1;
8166493378 2012-05-12        kinaba: 		if(d=='S') return -1;
8166493378 2012-05-12        kinaba: 		return 0;
8166493378 2012-05-12        kinaba: 	}
8166493378 2012-05-12        kinaba: };
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: // BEGIN CUT HERE
8166493378 2012-05-12        kinaba: #include <ctime>
8166493378 2012-05-12        kinaba: double start_time; string timer()
8166493378 2012-05-12        kinaba:  { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
8166493378 2012-05-12        kinaba: template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
8166493378 2012-05-12        kinaba:  { os << "{ ";
8166493378 2012-05-12        kinaba:    for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
8166493378 2012-05-12        kinaba:    os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
8166493378 2012-05-12        kinaba: void verify_case(const int& Expected, const int& Received) {
8166493378 2012-05-12        kinaba:  bool ok = (Expected == Received);
8166493378 2012-05-12        kinaba:  if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
8166493378 2012-05-12        kinaba:  cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
8166493378 2012-05-12        kinaba: #define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
8166493378 2012-05-12        kinaba: #define END	 verify_case(_, AntsMeet().countAnts(x, y, direction));}
8166493378 2012-05-12        kinaba: int main(){
8166493378 2012-05-12        kinaba: 
8166493378 2012-05-12        kinaba: CASE(0)
8166493378 2012-05-12        kinaba: 	int x_[] = {0,10,20,30};
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = {0,10,20,30};
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = "NWNE";
8166493378 2012-05-12        kinaba: 	int _ = 2;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: CASE(1)
8166493378 2012-05-12        kinaba: 	int x_[] = {-10,0,0,10};
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = {0,-10,10,0};
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = "NEWS";
8166493378 2012-05-12        kinaba: 	int _ = 0;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: CASE(2)
8166493378 2012-05-12        kinaba: 	int x_[] = {-1,-1,-1,0,0,0,1,1,1};
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = {-1,0,1,-1,0,1,-1,0,1};
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = "ESEWNNEWW";
8166493378 2012-05-12        kinaba: 	int _ = 4;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: CASE(3)
8166493378 2012-05-12        kinaba: 	int x_[] = {4,7,6,2,6,5,7,7,8,4,7,8,8,8,5,4,8,9,1,5,9,3,4,0,0,1,0,7,2,6,9,6,3,0,5,5,1,2,0,4,9,7,7,1,8,1,9,2,7,3};
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = {2,3,0,6,8,4,9,0,5,0,2,4,3,8,1,5,0,7,3,7,0,9,8,1,9,4,7,8,1,1,6,6,6,2,8,5,1,9,0,1,1,1,7,0,2,5,4,7,5,3};
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = "SSNWSWSENSWSESWEWSWSENWNNNESWSWSWWSSWEEWWNWWWNWENN" ;
8166493378 2012-05-12        kinaba: 	int _ = 25;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: CASE(4)
8166493378 2012-05-12        kinaba: 	int x_[] = {478,-664,759,434,-405,513,565,-396,311,-174,56,993,251,-341,993,-112,242,129,383,513,-78,-341,-148,129,423
8166493378 2012-05-12        kinaba: ,493,434,-405,478,-148,929,251,56,242,929,-78,423,-664,802,251,759,383,-112,-591,-591,-248,660,660,735,493};
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = {-186,98,948,795,289,-678,948,-170,-195,290,-354,-424,289,-157,-166,150,706,-678,684,-294,-234,36,36,-294,-216
8166493378 2012-05-12        kinaba: ,-234,427,945,265,-157,265,715,275,715,-186,337,798,-170,427,706,754,961,286,-216,798,286,961,684,-424,337};
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = "WNSNNSSWWWEENWESNSWSWSEWWEWEWWWNWESNSSNNSNNWWWNESE";
8166493378 2012-05-12        kinaba: 	int _ = 44;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: CASE(5)
8166493378 2012-05-12        kinaba: 	int x_[] = {0, 1, 0,  10,  9, 11};
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = {0, 1, 2,   10, 11, 11};
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = "NWSNES";
8166493378 2012-05-12        kinaba: 	int _ = 0;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: /*
8166493378 2012-05-12        kinaba: CASE(6)
8166493378 2012-05-12        kinaba: 	int x_[] = ;
8166493378 2012-05-12        kinaba: 	  vector <int> x(x_, x_+sizeof(x_)/sizeof(*x_));
8166493378 2012-05-12        kinaba: 	int y_[] = ;
8166493378 2012-05-12        kinaba: 	  vector <int> y(y_, y_+sizeof(y_)/sizeof(*y_));
8166493378 2012-05-12        kinaba: 	string direction = ;
8166493378 2012-05-12        kinaba: 	int _ = ;
8166493378 2012-05-12        kinaba: END
8166493378 2012-05-12        kinaba: */
8166493378 2012-05-12        kinaba: }
8166493378 2012-05-12        kinaba: // END CUT HERE