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 CreatePairs {
4fd800b3a8 2011-02-23        kinaba: public:
4fd800b3a8 2011-02-23        kinaba: 	int maximalSum(vector <int> data)
4fd800b3a8 2011-02-23        kinaba: 	{
4fd800b3a8 2011-02-23        kinaba: 		sort(data.begin(), data.end());
4fd800b3a8 2011-02-23        kinaba: 		vector<int>::iterator neg = upper_bound(data.begin(), data.end(), 0);
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 		LL sum = 0;
4fd800b3a8 2011-02-23        kinaba: 		for(vector<int>::iterator it=data.begin(); it!=neg; ++it)
4fd800b3a8 2011-02-23        kinaba: 			if( it+1 == neg )
4fd800b3a8 2011-02-23        kinaba: 				sum += *it;
4fd800b3a8 2011-02-23        kinaba: 			else
4fd800b3a8 2011-02-23        kinaba: 				sum += *it * *(it+1), ++it;
4fd800b3a8 2011-02-23        kinaba: 
4fd800b3a8 2011-02-23        kinaba: 		vector<int>::iterator pos = lower_bound(data.begin(), data.end(), 2);
4fd800b3a8 2011-02-23        kinaba: 		for(vector<int>::iterator it=data.end()-1; it>=pos; --it)
4fd800b3a8 2011-02-23        kinaba: 			if( it == pos )
4fd800b3a8 2011-02-23        kinaba: 				sum += *it;
4fd800b3a8 2011-02-23        kinaba: 			else
4fd800b3a8 2011-02-23        kinaba: 				sum += *it * *(it-1), --it;
4fd800b3a8 2011-02-23        kinaba: 		for(vector<int>::iterator it=neg; it!=pos; ++it)
4fd800b3a8 2011-02-23        kinaba: 			sum += *it;
4fd800b3a8 2011-02-23        kinaba: 		return sum;
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 int &Expected, const int &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: 	int data_[] = {0, 1, 2, 4, 3, 5};
4fd800b3a8 2011-02-23        kinaba: 	  vector <int> data(data_, data_+sizeof(data_)/sizeof(*data_));
4fd800b3a8 2011-02-23        kinaba: 	int RetVal = 27;
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, CreatePairs().maximalSum(data)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<1>) {
4fd800b3a8 2011-02-23        kinaba: 	int data_[] = {-1, 1, 2, 3};
4fd800b3a8 2011-02-23        kinaba: 	  vector <int> data(data_, data_+sizeof(data_)/sizeof(*data_));
4fd800b3a8 2011-02-23        kinaba: 	int RetVal = 6;
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, CreatePairs().maximalSum(data)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<2>) {
4fd800b3a8 2011-02-23        kinaba: 	int data_[] = {-1};
4fd800b3a8 2011-02-23        kinaba: 	  vector <int> data(data_, data_+sizeof(data_)/sizeof(*data_));
4fd800b3a8 2011-02-23        kinaba: 	int RetVal = -1;
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, CreatePairs().maximalSum(data)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<3>) {
4fd800b3a8 2011-02-23        kinaba: 	int data_[] = {-1, 0, 1};
4fd800b3a8 2011-02-23        kinaba: 	  vector <int> data(data_, data_+sizeof(data_)/sizeof(*data_));
4fd800b3a8 2011-02-23        kinaba: 	int RetVal = 1;
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, CreatePairs().maximalSum(data)); }
4fd800b3a8 2011-02-23        kinaba: int Test_(Case_<4>) {
4fd800b3a8 2011-02-23        kinaba: 	int data_[] = {1, 1};
4fd800b3a8 2011-02-23        kinaba: 	  vector <int> data(data_, data_+sizeof(data_)/sizeof(*data_));
4fd800b3a8 2011-02-23        kinaba: 	int RetVal = 2;
4fd800b3a8 2011-02-23        kinaba: 	return verify_case(RetVal, CreatePairs().maximalSum(data)); }
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: