제출 #822981

#제출 시각아이디문제언어결과실행 시간메모리
822981MohamedAhmed04Triangles (CEOI18_tri)C++14
35 / 100
3096 ms225500 KiB
#include "trilib.h" #include <bits/stdc++.h> using namespace std ; const int MAX = 500 + 10 ; int N ; int cntq = 0 ; unordered_map<int , int>mp[MAX][MAX] ; int Hash(int x , int y , int z) { return (1ll * x * (N+1) * (N+1) + y * (N+1) + z) ; } int query(int x , int y , int z) { if(mp[x][y][z]) return (mp[x][y][z] - 2) * -1 ; ++cntq ; // if(cntq > 1e6) // while(1) ; int ans = is_clockwise(x , y , z) ; mp[x][y][z] = mp[y][z][x] = mp[z][x][y] = 2-ans ; mp[x][z][y] = mp[y][x][z] = mp[z][y][x] = 2 - (!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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