제출 #822971

#제출 시각아이디문제언어결과실행 시간메모리
822971MohamedAhmed04Triangles (CEOI18_tri)C++14
0 / 100
1 ms212 KiB
#include "trilib.h"
#include <bits/stdc++.h>

using namespace std ;

const int MAX = 50 + 10 ;

int N ;

int cntq = 0 ;
map<int , int>mp ;

int Hash(int x , int y , int z)
{
	return (x * 2 + y*3 + z*5 + x * y * 7 + y * z * 11 + x * y * z * 13) ;
}

int query(int x , int y , int z)
{
	if(mp.find(Hash(x , y , z)) != mp.end())
		return mp[Hash(x , y , z)] ;
	++cntq ;
	// if(cntq > 1e6)
	// 	while(1) ;
	int ans = is_clockwise(x , y , z) ;
	mp[Hash(x , y , z)] = mp[Hash(y , z , x)] = mp[Hash(z , x , y)] = ans ;
	mp[Hash(x , z , y)] = mp[Hash(y , x , z)] = mp[Hash(z , y , x)] = !ans ;
	return ans ;
}

int main()
{
	srand(time(NULL)) ;
	mt19937 rng(rand()) ;
	N = get_n() ;
	int ans = 0 ;
	vector<int>v ;
	for(int i = 1 ; i <= N ; ++i)
	{
		bool flag = false ;
		for(int j = 1 ; j <= N && (!flag) ; ++j)
		{
			v.clear() ;
			for(int k = 1 ; k <= N ; ++k)
			{
				if(i == j || i == k || j == k)
					continue ;
				v.push_back(k) ;
			}
			shuffle(v.begin() , v.end() , rng) ;
			flag = (i != j) ;
			for(auto &k : v)
			{
				if(!flag)
					break ;
				flag &= query(i , j , k) ;
			}
		}
		ans += flag ;
	}
	give_answer(ans) ;
	return 0 ;
}
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