Submission #579400

#	Time	Username	Problem	Language	Result	Execution time	Memory
579400		amunduzbaev	Amusement Park (CEOI19_amusementpark)	C++17	42 / 100	3077 ms	98996 KiB

amusementpark

#include "bits/stdc++.h"
using namespace std;
 
#define ar array
typedef int64_t ll;
//~ #define int ll
 
const int N = 20;
const int P = 487;
const int mod = 119 << 23 | 1;
const int P2 = 167;
const int mod2 = 1e9 + 9;
vector<int> edges[N], qwe[N];
int used[N], is[N][N], cur[N];
 
signed main(){
	ios::sync_with_stdio(0); cin.tie(0);
	
	int n, m; cin>>n>>m;
	vector<ar<int, 2>> e(m);
	for(int i=0;i<m;i++){
		cin>>e[i][0]>>e[i][1];
		edges[e[i][0]].push_back(e[i][1]);
		edges[e[i][1]].push_back(e[i][0]);
		is[e[i][0]][e[i][1]] = 1;
	}
	
	for(int i=1;i<=n;i++) sort(edges[i].begin(), edges[i].end());
	
	vector<int> p(n);
	iota(p.begin(), p.end(), 1);
	int res = 0;
	vector<ar<int, 3>> tot;
	do{
		memset(used, 0, sizeof used);
		int cnt = 0;
		for(auto u : p){
			cur[u] = 0;
			qwe[u].clear();
			for(auto x : edges[u]){
				if(used[x]) continue;
				qwe[u].push_back(x);
				cur[u] |= (1 << x);
				if(!is[u][x]) cnt++;
			}
			
			used[u] = 1;
		}
		
		int hh = 0;
		for(int i=1;i<=n;i++){
			hh = (hh * 1ll * P + cur[i]) % mod;
		}
		int h2 = 0;
		for(int i=1;i<=n;i++){
			h2 = (h2 * 1ll * P2 + cur[i]) % mod2;
		}
		
		tot.push_back({hh, h2, cnt});
		//~ if(!ss.count({hh, h2})){
			//~ ss.insert({hh, h2});
			//~ res = (res + cnt) % mod;
		//~ }
	}while(next_permutation(p.begin(), p.end()));
	
	sort(tot.begin(), tot.end());
	for(int i=0;i<(int)tot.size();i++){
		if(!i || tot[i] != tot[i-1]){
			res += tot[i][2];
			if(res >= mod) res -= mod;
		}
	}
	
	cout<<res<<"\n";
}
 

• Subtask 1: 7 / 7
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 0 / 21
• Subtask 5: 0 / 37