Submission #1128408

#	Time	Username	Problem	Language	Result	Execution time	Memory
1128408		stdfloat	Political Development (BOI17_politicaldevelopment)	C++20	39 / 100	3106 ms	314796 KiB

politicaldevelopment

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

using ll = long long;

int mx;

vector<int> v;

vector<bool> vis;

vector<vector<bool>> edg;

vector<vector<int>> E;

void dfs(int x) {
	mx = max(mx, (int)v.size());
	for (auto i : E[x]) {
		if (vis[i]) continue;

		bool ok = true;
		for (auto j : v) {
			if (!edg[i][j] || !edg[j][i]) {
				ok = false;
				break;
			}
		}

		if (!ok) continue;

		vis[i] = true;
		v.push_back(i);

		dfs(i);

		vis[i] = false;
		v.pop_back();
	}
}

int main() {
	ios::sync_with_stdio(false); cin.tie(nullptr);

	int n, k;
	cin	>> n >> k;

	E.assign(n, {});
	edg.assign(n, vector<bool>(n));
	for (int i = 0; i < n; i++) {
		int d;
		cin >> d;
		while (d--) {
			int y;
			cin >> y;

			edg[i][y] = true;
			if (edg[y][i]) {
				E[i].push_back(y);
				E[y].push_back(i);
			}
		}
	}

	for (int i = 0; i < n; i++) {
		v = {i};
		vis.assign(n, false);
		vis[i] = true;

		dfs(i);
	}

	cout << mx;
}

• Subtask 1: 4 / 4
• Subtask 2: 12 / 12
• Subtask 3: 23 / 23
• Subtask 4: 0 / 38
• Subtask 5: 0 / 23