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 <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: 
4fd800b3a8 2011-02-23        kinaba: class GroupedWord {
4fd800b3a8 2011-02-23        kinaba: public:
4fd800b3a8 2011-02-23        kinaba: 	string restore(vector <string> parts)
4fd800b3a8 2011-02-23        kinaba: 	{
4fd800b3a8 2011-02-23        kinaba: 		while( reduce(parts) ) {}
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 		if( parts.size() == 1 )
4fd800b3a8 2011-02-23        kinaba: 			return gd(parts[0]) ? parts[0] : "IMPOSSIBLE";
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 		string s = accumulate(parts.begin(), parts.end(), string(""));
4fd800b3a8 2011-02-23        kinaba: 		return gd(s) ? "MANY" : "IMPOSSIBLE";
4fd800b3a8 2011-02-23        kinaba: 	}
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 	bool reduce( vector<string>& p )
4fd800b3a8 2011-02-23        kinaba: 	{
4fd800b3a8 2011-02-23        kinaba: 		for(int j=0; j<p.size(); ++j) {
4fd800b3a8 2011-02-23        kinaba: 			string& s = p[j];
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 			char last = s[s.size()-1];
4fd800b3a8 2011-02-23        kinaba: 			for(int i=0; i<p.size(); ++i) if(i!=j)
4fd800b3a8 2011-02-23        kinaba: 				if( count(p[i].begin(), p[i].end(), last) == p[i].size() )
4fd800b3a8 2011-02-23        kinaba: 				{
4fd800b3a8 2011-02-23        kinaba: 					p.push_back(s+p[i]);
4fd800b3a8 2011-02-23        kinaba: 					p.erase(p.begin()+max(i,j));
4fd800b3a8 2011-02-23        kinaba: 					p.erase(p.begin()+min(i,j));
4fd800b3a8 2011-02-23        kinaba: 					return true;
4fd800b3a8 2011-02-23        kinaba: 				}
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 			for(int i=0; i<p.size(); ++i) if(i!=j)
4fd800b3a8 2011-02-23        kinaba: 				if( p[i][0] == last )
4fd800b3a8 2011-02-23        kinaba: 				{
4fd800b3a8 2011-02-23        kinaba: 					p.push_back(s+p[i]);
4fd800b3a8 2011-02-23        kinaba: 					p.erase(p.begin()+max(i,j));
4fd800b3a8 2011-02-23        kinaba: 					p.erase(p.begin()+min(i,j));
4fd800b3a8 2011-02-23        kinaba: 					return true;
4fd800b3a8 2011-02-23        kinaba: 				}
4fd800b3a8 2011-02-23        kinaba: 		}
4fd800b3a8 2011-02-23        kinaba: 		return false;
4fd800b3a8 2011-02-23        kinaba: 	}
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 	bool gd(const string& s)
4fd800b3a8 2011-02-23        kinaba: 	{
4fd800b3a8 2011-02-23        kinaba: 		for(int i=0; i<s.size(); )
4fd800b3a8 2011-02-23        kinaba: 		{
4fd800b3a8 2011-02-23        kinaba: 			int j=i;
4fd800b3a8 2011-02-23        kinaba: 			while( j<s.size() && s[i]==s[j] ) ++j;
4fd800b3a8 2011-02-23        kinaba: 			if( s.find(s[i], j)!=string::npos )
4fd800b3a8 2011-02-23        kinaba: 				return false;
4fd800b3a8 2011-02-23        kinaba: 			i=j;
4fd800b3a8 2011-02-23        kinaba: 		}
4fd800b3a8 2011-02-23        kinaba: 		return true;
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() { ostringstream os; os << " (" << int((clock()-start_time)/CLOCKS_PER_SEC*1000) << " msec)"; return os.str(); }
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: template <typename T> string print_array(const vector<T> &V) { ostringstream os; os << "{ "; for (typename vector<T>::const_iterator iter = V.begin(); iter != V.end(); ++iter) os << '\"' << *iter << "\","; os << " }"; return os.str(); }
4fd800b3a8 2011-02-23        kinaba: int verify_case(const string &Expected, const string &Received) { if (Expected == Received) cerr << "PASSED" << timer() << endl; else { cerr << "FAILED" << timer() << endl; cerr << "\tExpected: \"" << Expected << '\"' << endl; cerr << "\tReceived: \"" << Received << '\"' << endl; } return 0;}
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: template<int N> struct Case_ { Case_(){start_time=clock();} };
4fd800b3a8 2011-02-23        kinaba: char Test_(...);
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<0>) {
4fd800b3a8 2011-02-23        kinaba: 	string parts_[] = {"aaa", "a", "aa"};
4fd800b3a8 2011-02-23        kinaba: 	  vector <string> parts(parts_, parts_+sizeof(parts_)/sizeof(*parts_));
4fd800b3a8 2011-02-23        kinaba: 	string RetVal = "aaaaaa";
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, GroupedWord().restore(parts)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<1>) {
4fd800b3a8 2011-02-23        kinaba: 	string parts_[] = {"ab", "bba"};
4fd800b3a8 2011-02-23        kinaba: 	  vector <string> parts(parts_, parts_+sizeof(parts_)/sizeof(*parts_));
4fd800b3a8 2011-02-23        kinaba: 	string RetVal = "IMPOSSIBLE";
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, GroupedWord().restore(parts)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<2>) {
4fd800b3a8 2011-02-23        kinaba: 	string parts_[] = {"te", "st"};
4fd800b3a8 2011-02-23        kinaba: 	  vector <string> parts(parts_, parts_+sizeof(parts_)/sizeof(*parts_));
4fd800b3a8 2011-02-23        kinaba: 	string RetVal = "stte";
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, GroupedWord().restore(parts)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<3>) {
4fd800b3a8 2011-02-23        kinaba: 	string parts_[] = {"te", "s", "t"};
4fd800b3a8 2011-02-23        kinaba: 	  vector <string> parts(parts_, parts_+sizeof(parts_)/sizeof(*parts_));
4fd800b3a8 2011-02-23        kinaba: 	string RetVal = "MANY";
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, GroupedWord().restore(parts)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<4>) {
4fd800b3a8 2011-02-23        kinaba: 	string parts_[] = {"orr", "rd", "woo", "www"};
4fd800b3a8 2011-02-23        kinaba: 	  vector <string> parts(parts_, parts_+sizeof(parts_)/sizeof(*parts_));
4fd800b3a8 2011-02-23        kinaba: 	string RetVal = "wwwwooorrrd";
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, GroupedWord().restore(parts)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<5>) {
4fd800b3a8 2011-02-23        kinaba: 	string parts_[] = {"abcb"};
4fd800b3a8 2011-02-23        kinaba: 	  vector <string> parts(parts_, parts_+sizeof(parts_)/sizeof(*parts_));
4fd800b3a8 2011-02-23        kinaba: 	string RetVal = "IMPOSSIBLE";
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, GroupedWord().restore(parts)); }
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: template<int N> void Run_() { cerr << "Test Case #" << N << "..." << flush; Test_(Case_<N>()); Run_<sizeof(Test_(Case_<N+1>()))==1 ? -1 : N+1>(); }
4fd800b3a8 2011-02-23        kinaba: template<>      void Run_<-1>() {}
4fd800b3a8 2011-02-23        kinaba: int main() { Run_<0>(); }
4fd800b3a8 2011-02-23        kinaba: // END CUT HERE
4fd800b3a8 2011-02-23        kinaba: