db58c713f6 2012-02-24        kinaba: #include <iostream>
db58c713f6 2012-02-24        kinaba: #include <sstream>
db58c713f6 2012-02-24        kinaba: #include <iomanip>
db58c713f6 2012-02-24        kinaba: #include <vector>
db58c713f6 2012-02-24        kinaba: #include <string>
db58c713f6 2012-02-24        kinaba: #include <map>
db58c713f6 2012-02-24        kinaba: #include <set>
db58c713f6 2012-02-24        kinaba: #include <algorithm>
db58c713f6 2012-02-24        kinaba: #include <numeric>
db58c713f6 2012-02-24        kinaba: #include <iterator>
db58c713f6 2012-02-24        kinaba: #include <functional>
db58c713f6 2012-02-24        kinaba: #include <complex>
db58c713f6 2012-02-24        kinaba: #include <queue>
db58c713f6 2012-02-24        kinaba: #include <stack>
db58c713f6 2012-02-24        kinaba: #include <cmath>
db58c713f6 2012-02-24        kinaba: #include <cassert>
db58c713f6 2012-02-24        kinaba: #include <cstring>
db58c713f6 2012-02-24        kinaba: #ifdef __GNUC__
db58c713f6 2012-02-24        kinaba: #include <ext/hash_map>
db58c713f6 2012-02-24        kinaba: #define unordered_map __gnu_cxx::hash_map
db58c713f6 2012-02-24        kinaba: #else
db58c713f6 2012-02-24        kinaba: #include <unordered_map>
db58c713f6 2012-02-24        kinaba: #endif
db58c713f6 2012-02-24        kinaba: using namespace std;
db58c713f6 2012-02-24        kinaba: typedef long long LL;
db58c713f6 2012-02-24        kinaba: typedef complex<double> CMP;
db58c713f6 2012-02-24        kinaba: 
db58c713f6 2012-02-24        kinaba: class EllysCheckers { public:
db58c713f6 2012-02-24        kinaba: 	string getWinner(string board)
db58c713f6 2012-02-24        kinaba: 	{
db58c713f6 2012-02-24        kinaba: 		int N = board.size()-1;
db58c713f6 2012-02-24        kinaba: 		int mask = 0;
db58c713f6 2012-02-24        kinaba: 		for(int i=0; i<N; ++i)
db58c713f6 2012-02-24        kinaba: 			mask |= (board[i]=='o')<<i;
db58c713f6 2012-02-24        kinaba: 		vector<int> memo(1<<N, -1);
db58c713f6 2012-02-24        kinaba: 		return win(memo, N, mask) ? "YES" : "NO";
db58c713f6 2012-02-24        kinaba: 	}
db58c713f6 2012-02-24        kinaba: 
db58c713f6 2012-02-24        kinaba: 	bool win(vector<int>& memo, int N, int mask)
db58c713f6 2012-02-24        kinaba: 	{
db58c713f6 2012-02-24        kinaba: 		mask &= (1<<N)-1;
db58c713f6 2012-02-24        kinaba: 		if( memo[mask] != -1 )
db58c713f6 2012-02-24        kinaba: 			return memo[mask];
db58c713f6 2012-02-24        kinaba: 		if( mask == 0 ) // no checker, no move => lose
db58c713f6 2012-02-24        kinaba: 			return 0;
db58c713f6 2012-02-24        kinaba: 
db58c713f6 2012-02-24        kinaba: 		bool I_win = false;
db58c713f6 2012-02-24        kinaba: 		// enumerate all possible moves
db58c713f6 2012-02-24        kinaba: 		for(int i=0; i<N; ++i)
db58c713f6 2012-02-24        kinaba: 			if( mask & (1<<i) ) {
db58c713f6 2012-02-24        kinaba: 				if( !(mask & (1<<i+1)) ) { // step
db58c713f6 2012-02-24        kinaba: 					int newmask = mask &~ (1<<i) | (1<<i+1);
db58c713f6 2012-02-24        kinaba: 					if( !win(memo, N, newmask) )
db58c713f6 2012-02-24        kinaba: 						I_win = true;
db58c713f6 2012-02-24        kinaba: 				}
db58c713f6 2012-02-24        kinaba: 				if( (mask & (1<<i+1)) && (mask & (1<<i+2)) && !(mask & (1<<i+3)) ) { // jump
db58c713f6 2012-02-24        kinaba: 					int newmask = mask &~ (1<<i) | (1<<i+3);
db58c713f6 2012-02-24        kinaba: 					if( !win(memo, N, newmask) )
db58c713f6 2012-02-24        kinaba: 						I_win = true;
db58c713f6 2012-02-24        kinaba: 				}
db58c713f6 2012-02-24        kinaba: 			}
db58c713f6 2012-02-24        kinaba: 		return memo[mask] = I_win;
db58c713f6 2012-02-24        kinaba: 	}
db58c713f6 2012-02-24        kinaba: };
db58c713f6 2012-02-24        kinaba: 
db58c713f6 2012-02-24        kinaba: // BEGIN CUT HERE
db58c713f6 2012-02-24        kinaba: #include <ctime>
db58c713f6 2012-02-24        kinaba: double start_time; string timer()
db58c713f6 2012-02-24        kinaba:  { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
db58c713f6 2012-02-24        kinaba: template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
db58c713f6 2012-02-24        kinaba:  { os << "{ ";
db58c713f6 2012-02-24        kinaba:    for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
db58c713f6 2012-02-24        kinaba:    os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
db58c713f6 2012-02-24        kinaba: void verify_case(const string& Expected, const string& Received) {
db58c713f6 2012-02-24        kinaba:  bool ok = (Expected == Received);
db58c713f6 2012-02-24        kinaba:  if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
db58c713f6 2012-02-24        kinaba:  cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
db58c713f6 2012-02-24        kinaba: #define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
db58c713f6 2012-02-24        kinaba: #define END	 verify_case(_, EllysCheckers().getWinner(board));}
db58c713f6 2012-02-24        kinaba: int main(){
db58c713f6 2012-02-24        kinaba: 
db58c713f6 2012-02-24        kinaba: CASE(0)
db58c713f6 2012-02-24        kinaba: 	string board = ".o...";
db58c713f6 2012-02-24        kinaba: 	string _ = "YES";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(1)
db58c713f6 2012-02-24        kinaba: 	string board = "..o..o";
db58c713f6 2012-02-24        kinaba: 	string _ = "YES";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(2)
db58c713f6 2012-02-24        kinaba: 	string board = ".o...ooo..oo..";
db58c713f6 2012-02-24        kinaba: 	string _ = "NO";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(3)
db58c713f6 2012-02-24        kinaba: 	string board = "......o.ooo.o......";
db58c713f6 2012-02-24        kinaba: 	string _ = "YES";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(4)
db58c713f6 2012-02-24        kinaba: 	string board = ".o..o...o....o.....o";
db58c713f6 2012-02-24        kinaba: 	string _ = "NO";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(5)
db58c713f6 2012-02-24        kinaba: 	string board = "oooooooooooooooooooo";
db58c713f6 2012-02-24        kinaba: 	string _ = "?";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(6)
db58c713f6 2012-02-24        kinaba: 	string board = "o.o.o.o.o.o.o.o.o.o.";
db58c713f6 2012-02-24        kinaba: 	string _ = "?";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(7)
db58c713f6 2012-02-24        kinaba: 	string board = ".";
db58c713f6 2012-02-24        kinaba: 	string _ = "NO";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(8)
db58c713f6 2012-02-24        kinaba: 	string board = ".";
db58c713f6 2012-02-24        kinaba: 	string _ = "NO";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: CASE(9)
db58c713f6 2012-02-24        kinaba: 	string board = "o.";
db58c713f6 2012-02-24        kinaba: 	string _ = "YES";
db58c713f6 2012-02-24        kinaba: END
db58c713f6 2012-02-24        kinaba: 
db58c713f6 2012-02-24        kinaba: }
db58c713f6 2012-02-24        kinaba: // END CUT HERE