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47cb6fde79 2013-06-08        kinaba: #include <iostream>
47cb6fde79 2013-06-08        kinaba: #include <sstream>
47cb6fde79 2013-06-08        kinaba: #include <iomanip>
47cb6fde79 2013-06-08        kinaba: #include <vector>
47cb6fde79 2013-06-08        kinaba: #include <string>
47cb6fde79 2013-06-08        kinaba: #include <map>
47cb6fde79 2013-06-08        kinaba: #include <set>
47cb6fde79 2013-06-08        kinaba: #include <algorithm>
47cb6fde79 2013-06-08        kinaba: #include <numeric>
47cb6fde79 2013-06-08        kinaba: #include <iterator>
47cb6fde79 2013-06-08        kinaba: #include <functional>
47cb6fde79 2013-06-08        kinaba: #include <complex>
47cb6fde79 2013-06-08        kinaba: #include <queue>
47cb6fde79 2013-06-08        kinaba: #include <stack>
47cb6fde79 2013-06-08        kinaba: #include <cmath>
47cb6fde79 2013-06-08        kinaba: #include <cassert>
47cb6fde79 2013-06-08        kinaba: using namespace std;
47cb6fde79 2013-06-08        kinaba: typedef long long LL;
47cb6fde79 2013-06-08        kinaba: typedef long double LD;
47cb6fde79 2013-06-08        kinaba: typedef complex<double> CMP;
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: static const int INF = 0x1fffffff;
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: int bitcnt(int x)
47cb6fde79 2013-06-08        kinaba: {
47cb6fde79 2013-06-08        kinaba: 	int c = 0;
47cb6fde79 2013-06-08        kinaba: 	for(; x; x>>=1)
47cb6fde79 2013-06-08        kinaba: 		c += x&1;
47cb6fde79 2013-06-08        kinaba: 	return c;
47cb6fde79 2013-06-08        kinaba: }
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: class YetAnotherBoardGame { public:
47cb6fde79 2013-06-08        kinaba: 	int g_best;
47cb6fde79 2013-06-08        kinaba: 	int minimumMoves(vector <string> board)
47cb6fde79 2013-06-08        kinaba: 	{
47cb6fde79 2013-06-08        kinaba: 		int H = board.size();
47cb6fde79 2013-06-08        kinaba: 		int W = board[0].size();
47cb6fde79 2013-06-08        kinaba: 		vector<int> b(H);
47cb6fde79 2013-06-08        kinaba: 		for(int y=0; y<H; ++y)
47cb6fde79 2013-06-08        kinaba: 			for(int x=0; x<W; ++x)
47cb6fde79 2013-06-08        kinaba: 				b[y] |= (board[y][x]=='W')<<x;
47cb6fde79 2013-06-08        kinaba: 		b.push_back(0); // sentinel
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: 		g_best = INF;
47cb6fde79 2013-06-08        kinaba: 		for(int type=1; type<=2; ++type)
47cb6fde79 2013-06-08        kinaba: 			for(int mask=0; mask<(1<<W); ++mask)
47cb6fde79 2013-06-08        kinaba: 			{
47cb6fde79 2013-06-08        kinaba: 				int cur = b[0];
47cb6fde79 2013-06-08        kinaba: 				int next = b[1];
47cb6fde79 2013-06-08        kinaba: 				flip(cur, next, mask, type, W);
47cb6fde79 2013-06-08        kinaba: 				do_try(cur, next, b, 1, H, W, (type==1 ? mask : 0), (type==2 ? mask : 0), bitcnt(mask));
47cb6fde79 2013-06-08        kinaba: 			}
47cb6fde79 2013-06-08        kinaba: 		return g_best==INF ? -1 : g_best;
47cb6fde79 2013-06-08        kinaba: 	}
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: 	void flip(int& cur, int& next, int mask, int type, int W)
47cb6fde79 2013-06-08        kinaba: 	{
47cb6fde79 2013-06-08        kinaba: 		int pat = (type==1 ? 5 : 7);
47cb6fde79 2013-06-08        kinaba: 		for(int f=0; (1<<f)<=mask; ++f)
47cb6fde79 2013-06-08        kinaba: 			if((1<<f) & mask)
47cb6fde79 2013-06-08        kinaba: 				cur ^= (pat<<f>>1)&((1<<W)-1);
47cb6fde79 2013-06-08        kinaba: 		next ^= mask;
47cb6fde79 2013-06-08        kinaba: 	}
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: 	void do_try(int prev, int cur, const vector<int>& b, int y, int H, int W, int must_t1, int must_t2, int acc)
47cb6fde79 2013-06-08        kinaba: 	{
47cb6fde79 2013-06-08        kinaba: 		if(y==H) {
47cb6fde79 2013-06-08        kinaba: 			int score = (prev==0 ? 0 : INF) + acc;
47cb6fde79 2013-06-08        kinaba: 			g_best = min(g_best, score);
47cb6fde79 2013-06-08        kinaba: 			return;
47cb6fde79 2013-06-08        kinaba: 		}
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: 		int mask = prev;
47cb6fde79 2013-06-08        kinaba: 		int score = bitcnt(mask) + acc;
47cb6fde79 2013-06-08        kinaba: 		if(score >= g_best)
47cb6fde79 2013-06-08        kinaba: 			return;
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: 		if(!(mask&must_t2)) { // try type 1
47cb6fde79 2013-06-08        kinaba: 			int curr = cur;
47cb6fde79 2013-06-08        kinaba: 			int next = b[y+1];
47cb6fde79 2013-06-08        kinaba: 			flip(curr, next, mask, 1, W);
47cb6fde79 2013-06-08        kinaba: 			do_try(curr, next, b, y+1, H, W, must_t1|mask, must_t2, score);
47cb6fde79 2013-06-08        kinaba: 		}
47cb6fde79 2013-06-08        kinaba: 		if(!(mask&must_t1)) { // try type 2
47cb6fde79 2013-06-08        kinaba: 			int curr = cur;
47cb6fde79 2013-06-08        kinaba: 			int next = b[y+1];
47cb6fde79 2013-06-08        kinaba: 			flip(curr, next, mask, 2, W);
47cb6fde79 2013-06-08        kinaba: 			do_try(curr, next, b, y+1, H, W, must_t1, must_t2|mask, score);
47cb6fde79 2013-06-08        kinaba: 		}
47cb6fde79 2013-06-08        kinaba: 	}
47cb6fde79 2013-06-08        kinaba: };
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: // BEGIN CUT HERE
47cb6fde79 2013-06-08        kinaba: #include <ctime>
47cb6fde79 2013-06-08        kinaba: double start_time; string timer()
47cb6fde79 2013-06-08        kinaba:  { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
47cb6fde79 2013-06-08        kinaba: template<typename T> ostream& operator<<(ostream& os, const vector<T>& v)
47cb6fde79 2013-06-08        kinaba:  { os << "{ ";
47cb6fde79 2013-06-08        kinaba:    for(typename vector<T>::const_iterator it=v.begin(); it!=v.end(); ++it)
47cb6fde79 2013-06-08        kinaba:    os << '\"' << *it << '\"' << (it+1==v.end() ? "" : ", "); os << " }"; return os; }
47cb6fde79 2013-06-08        kinaba: void verify_case(const int& Expected, const int& Received) {
47cb6fde79 2013-06-08        kinaba:  bool ok = (Expected == Received);
47cb6fde79 2013-06-08        kinaba:  if(ok) cerr << "PASSED" << timer() << endl;  else { cerr << "FAILED" << timer() << endl;
47cb6fde79 2013-06-08        kinaba:  cerr << "\to: \"" << Expected << '\"' << endl << "\tx: \"" << Received << '\"' << endl; } }
47cb6fde79 2013-06-08        kinaba: #define CASE(N) {cerr << "Test Case #" << N << "..." << flush; start_time=clock();
47cb6fde79 2013-06-08        kinaba: #define END	 verify_case(_, YetAnotherBoardGame().minimumMoves(board));}
47cb6fde79 2013-06-08        kinaba: int main(){
47cb6fde79 2013-06-08        kinaba: 
47cb6fde79 2013-06-08        kinaba: CASE(0)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = {"BBBBBBBBB",
47cb6fde79 2013-06-08        kinaba:  "BBWBBBBBB",
47cb6fde79 2013-06-08        kinaba:  "BWWWBBBBB",
47cb6fde79 2013-06-08        kinaba:  "BBWBBBWBB",
47cb6fde79 2013-06-08        kinaba:  "BBBBBWBWB",
47cb6fde79 2013-06-08        kinaba:  "BBBBBBWBB"};
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = 2;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: CASE(1)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = {"BBW",
47cb6fde79 2013-06-08        kinaba:  "WWW",
47cb6fde79 2013-06-08        kinaba:  "BWW"};
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = 2;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: CASE(2)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = {"WBW",
47cb6fde79 2013-06-08        kinaba:  "BBW",
47cb6fde79 2013-06-08        kinaba:  "WBW"};
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = 4;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: CASE(3)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = {"BBBB",
47cb6fde79 2013-06-08        kinaba:  "WBWB",
47cb6fde79 2013-06-08        kinaba:  "BBBB",
47cb6fde79 2013-06-08        kinaba:  "BBBB"};
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = -1;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: CASE(4)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = {"WWWWWBW",
47cb6fde79 2013-06-08        kinaba:  "WBWBWBW",
47cb6fde79 2013-06-08        kinaba:  "BBWBBWW"};
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = 7;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: CASE(5)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = {"WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW",
47cb6fde79 2013-06-08        kinaba:  "WWWWWWWWWW"}
47cb6fde79 2013-06-08        kinaba: ;
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = 30;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: /*
47cb6fde79 2013-06-08        kinaba: CASE(6)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = ;
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = ;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: CASE(7)
47cb6fde79 2013-06-08        kinaba: 	string board_[] = ;
47cb6fde79 2013-06-08        kinaba: 	  vector <string> board(board_, board_+sizeof(board_)/sizeof(*board_));
47cb6fde79 2013-06-08        kinaba: 	int _ = ;
47cb6fde79 2013-06-08        kinaba: END
47cb6fde79 2013-06-08        kinaba: */
47cb6fde79 2013-06-08        kinaba: }
47cb6fde79 2013-06-08        kinaba: // END CUT HERE
Fossil version [8d758d3715] 2012-10-22 12:48:04