Submission #1113482

#	Time	Username	Problem	Language	Result	Execution time	Memory
1113482		Nonoze	Make them Meet (EGOI24_makethemmeet)	C++17	33.66 / 100	724 ms	22980 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define sz(x) (int)x.size()
#define all(x) (x).begin(), (x).end()
#define rall(x) (x).rbegin(), (x).rend()
#define cmin(a, b) a=min(a, b)
#define cmax(a, b) a=max(a, b)
#define fi first
#define se second
#define pb push_back
#define mp make_pair

#define int long long

void solve();

signed main() {
	ios::sync_with_stdio(0); cin.tie(0);
	solve();
	return 0;
}

vector<vector<int>> vec;


void print() {
	cout << sz(vec) << endl;
	for (auto &a: vec) {
		for (auto &u: a) cout << u << ' ';
		cout << endl;
	}
	cout << endl;
}

void add(vector<int> &a) { vec.pb(a); }

int n, m;
vector<int> a;
vector<set<int>> adj;
vector<bool> visited, visited2, ok, tovisit;

bool dfs(int x) {
	bool flag=0;
	if (ok[x]) flag=1;
	visited2[x]=1;
	for (auto u: adj[x]) if (!visited[u] && !visited2[u]) {
		flag|=dfs(u);
	}
	return tovisit[x]=flag;
}


void execute(int x) {
	visited[x]=1;
	for (auto u: adj[x]) if (!visited[u]) {
		visited2.clear(), visited2.resize(n, 0);
		tovisit.clear(), tovisit.resize(n, 0);
		dfs(u);
		if (tovisit[u]) {
			auto temp=a; temp[x]=0, temp[u]=0;
			add(temp);
			execute(u);
			add(temp);
		}
	}
}

void solve() {
	cin >> n >> m; a.clear(), a.resize(n, 0); iota(all(a), 1);
	adj.clear(), adj.resize(n), ok.clear(), ok.resize(n, 1);
	vector<set<int>> adjbase;
	for (int i=0; i<m; i++) {
		int u, v; cin >> u >> v;
		adj[u].insert(v), adj[v].insert(u);
	}
	adjbase=adj;
	for (int i=0; i<n-1; i++) {
		int best=-1;
		for (int j=0; j<n; j++) if ((best==-1 && ok[j]) || (sz(adjbase[j])!=0 && sz(adjbase[best])>sz(adjbase[j]))) {
			best=j;
		}
		visited.clear(), visited.resize(n, 0);
		execute(best);
		ok[best]=0;
		for (auto u: adjbase[best]) {
			adjbase[u].erase(best);
		}
		adjbase[best].clear();
	}
	print();
}

• Subtask 1: 3.694915254 / 10
• Subtask 2: 3.8091898429 / 13
• Subtask 3: 4.0644067794000005 / 11
• Subtask 4: 13.3016949144 / 36
• Subtask 5: 8.790438099000001 / 30