892b20bec8 2015-04-28        kinaba: #include <iostream>
892b20bec8 2015-04-28        kinaba: #include <sstream>
892b20bec8 2015-04-28        kinaba: #include <iomanip>
892b20bec8 2015-04-28        kinaba: #include <vector>
892b20bec8 2015-04-28        kinaba: #include <string>
892b20bec8 2015-04-28        kinaba: #include <map>
892b20bec8 2015-04-28        kinaba: #include <set>
892b20bec8 2015-04-28        kinaba: #include <algorithm>
892b20bec8 2015-04-28        kinaba: #include <numeric>
892b20bec8 2015-04-28        kinaba: #include <iterator>
892b20bec8 2015-04-28        kinaba: #include <functional>
892b20bec8 2015-04-28        kinaba: #include <complex>
892b20bec8 2015-04-28        kinaba: #include <queue>
892b20bec8 2015-04-28        kinaba: #include <stack>
892b20bec8 2015-04-28        kinaba: #include <cmath>
892b20bec8 2015-04-28        kinaba: #include <cassert>
892b20bec8 2015-04-28        kinaba: #include <tuple>
892b20bec8 2015-04-28        kinaba: using namespace std;
892b20bec8 2015-04-28        kinaba: typedef long long LL;
892b20bec8 2015-04-28        kinaba: typedef complex<double> CMP;
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: class BichromePainting { public:
892b20bec8 2015-04-28        kinaba: 	string isThatPossible(vector <string> board, int k)
892b20bec8 2015-04-28        kinaba: 	{
892b20bec8 2015-04-28        kinaba: 		return solve(board, k) ? "Possible" : "Impossible";
892b20bec8 2015-04-28        kinaba: 	}
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: 	bool solve(vector<string> board, int K)
892b20bec8 2015-04-28        kinaba: 	{
892b20bec8 2015-04-28        kinaba: 		while(!no_black(board))
892b20bec8 2015-04-28        kinaba: 			if(!step_back(board, K))
892b20bec8 2015-04-28        kinaba: 				return false;
892b20bec8 2015-04-28        kinaba: 		return true;
892b20bec8 2015-04-28        kinaba: 	}
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: 	bool no_black(const vector<string>& board)
892b20bec8 2015-04-28        kinaba: 	{
892b20bec8 2015-04-28        kinaba: 		const int H = board.size();
892b20bec8 2015-04-28        kinaba: 		const int W = board[0].size();
892b20bec8 2015-04-28        kinaba: 		for(int y=0; y<H; ++y)
892b20bec8 2015-04-28        kinaba: 		for(int x=0; x<W; ++x) if(board[y][x] == 'B')
892b20bec8 2015-04-28        kinaba: 			return false;
892b20bec8 2015-04-28        kinaba: 		return true;
892b20bec8 2015-04-28        kinaba: 	}
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: 	bool step_back(vector<string>& board, int K) {
892b20bec8 2015-04-28        kinaba: 		bool updated = false;
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: 		const int H = board.size();
892b20bec8 2015-04-28        kinaba: 		const int W = board[0].size();
892b20bec8 2015-04-28        kinaba: 		for(int y=0; y+K<=H; ++y)
892b20bec8 2015-04-28        kinaba: 		for(int x=0; x+K<=W; ++x) {
892b20bec8 2015-04-28        kinaba: 			bool has_white = false;
892b20bec8 2015-04-28        kinaba: 			bool has_black = false;
892b20bec8 2015-04-28        kinaba: 			for(int dy=0; dy<K; ++dy)
892b20bec8 2015-04-28        kinaba: 			for(int dx=0; dx<K; ++dx) {
892b20bec8 2015-04-28        kinaba: 				if(board[y+dy][x+dx]=='W') has_white=true;
892b20bec8 2015-04-28        kinaba: 				if(board[y+dy][x+dx]=='B') has_black=true;
892b20bec8 2015-04-28        kinaba: 			}
892b20bec8 2015-04-28        kinaba: 			if(has_white && has_black)
892b20bec8 2015-04-28        kinaba: 				continue;
892b20bec8 2015-04-28        kinaba: 			if(has_white || has_black) {
892b20bec8 2015-04-28        kinaba: 				for(int dy=0; dy<K; ++dy)
892b20bec8 2015-04-28        kinaba: 				for(int dx=0; dx<K; ++dx)
892b20bec8 2015-04-28        kinaba: 					board[y+dy][x+dx] = '*';
892b20bec8 2015-04-28        kinaba: 				updated = true;
892b20bec8 2015-04-28        kinaba: 			}
892b20bec8 2015-04-28        kinaba: 		}
892b20bec8 2015-04-28        kinaba: 		return updated;
892b20bec8 2015-04-28        kinaba: 	}
892b20bec8 2015-04-28        kinaba: };
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: // BEGIN CUT HERE
892b20bec8 2015-04-28        kinaba: #include <ctime>
892b20bec8 2015-04-28        kinaba: double start_time; string timer()
892b20bec8 2015-04-28        kinaba:  { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
892b20bec8 2015-04-28        kinaba: template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
892b20bec8 2015-04-28        kinaba:  { os << "{ ";
892b20bec8 2015-04-28        kinaba:    for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
892b20bec8 2015-04-28        kinaba:    os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
892b20bec8 2015-04-28        kinaba: void verify_case(const string& Expected, const string& Received) {
892b20bec8 2015-04-28        kinaba:  bool ok = (Expected == Received);
892b20bec8 2015-04-28        kinaba:  if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
892b20bec8 2015-04-28        kinaba:  cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
892b20bec8 2015-04-28        kinaba: #define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
892b20bec8 2015-04-28        kinaba: #define END	 verify_case(_, BichromePainting().isThatPossible(board, k));}
892b20bec8 2015-04-28        kinaba: int main(){
892b20bec8 2015-04-28        kinaba: 
892b20bec8 2015-04-28        kinaba: CASE(0)
892b20bec8 2015-04-28        kinaba: 	string board_[] = {"BBBW",
892b20bec8 2015-04-28        kinaba:  "BWWW",
892b20bec8 2015-04-28        kinaba:  "BWWW",
892b20bec8 2015-04-28        kinaba:  "WWWW"};
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 3;
892b20bec8 2015-04-28        kinaba: 	string _ = "Possible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: CASE(1)
892b20bec8 2015-04-28        kinaba: 	string board_[] = {"BW",
892b20bec8 2015-04-28        kinaba:  "WB"}
892b20bec8 2015-04-28        kinaba: ;
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 2;
892b20bec8 2015-04-28        kinaba: 	string _ = "Impossible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: CASE(2)
892b20bec8 2015-04-28        kinaba: 	string board_[] = {"BWBWBB",
892b20bec8 2015-04-28        kinaba:  "WBWBBB",
892b20bec8 2015-04-28        kinaba:  "BWBWBB",
892b20bec8 2015-04-28        kinaba:  "WBWBBB",
892b20bec8 2015-04-28        kinaba:  "BBBBBB",
892b20bec8 2015-04-28        kinaba:  "BBBBBB"}
892b20bec8 2015-04-28        kinaba: ;
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 2;
892b20bec8 2015-04-28        kinaba: 	string _ = "Possible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: CASE(3)
892b20bec8 2015-04-28        kinaba: 	string board_[] = {"BWBWBB",
892b20bec8 2015-04-28        kinaba:  "WBWBWB",
892b20bec8 2015-04-28        kinaba:  "BWBWBB",
892b20bec8 2015-04-28        kinaba:  "WBWBWB",
892b20bec8 2015-04-28        kinaba:  "BWBWBB",
892b20bec8 2015-04-28        kinaba:  "BBBBBB"}
892b20bec8 2015-04-28        kinaba: ;
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 2;
892b20bec8 2015-04-28        kinaba: 	string _ = "Impossible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: CASE(4)
892b20bec8 2015-04-28        kinaba: 	string board_[] = {"BWBWBB",
892b20bec8 2015-04-28        kinaba:  "WBWBWB",
892b20bec8 2015-04-28        kinaba:  "BWBWBB",
892b20bec8 2015-04-28        kinaba:  "WBWBWB",
892b20bec8 2015-04-28        kinaba:  "BWBWBB",
892b20bec8 2015-04-28        kinaba:  "BBBBBB"}
892b20bec8 2015-04-28        kinaba: ;
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 1;
892b20bec8 2015-04-28        kinaba: 	string _ = "Possible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: CASE(5)
892b20bec8 2015-04-28        kinaba: 	string board_[] = {"BB",
892b20bec8 2015-04-28        kinaba:  "BB"};
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 2;
892b20bec8 2015-04-28        kinaba: 	string _ = "Possible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: CASE(6)
892b20bec8 2015-04-28        kinaba: string board_[] = {"BBWW", "BBWW", "WBBW", "WWWW"};
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = 2;
892b20bec8 2015-04-28        kinaba: 	string _ = "Possible";
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: /*
892b20bec8 2015-04-28        kinaba: CASE(7)
892b20bec8 2015-04-28        kinaba: 	string board_[] = ;
892b20bec8 2015-04-28        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
892b20bec8 2015-04-28        kinaba: 	int k = ;
892b20bec8 2015-04-28        kinaba: 	string _ = ;
892b20bec8 2015-04-28        kinaba: END
892b20bec8 2015-04-28        kinaba: */
892b20bec8 2015-04-28        kinaba: }
892b20bec8 2015-04-28        kinaba: // END CUT HERE