Submission #884293

#	Time	Username	Problem	Language	Result	Execution time	Memory
884293		vjudge1	Bosses (BOI16_bosses)	C++17	0 / 100	0 ms	348 KiB

bosses

#include <bits/stdc++.h>
#define file_io freopen("input.txt", "r", stdin);freopen("output.txt", "w", stdout);
#define fast_io ios::sync_with_stdio(false);cin.tie(0);
#define what(x) cerr << #x << " is " << x << '\n';
#define kill(x) {cout << x << '\n'; return 0;}
#define all(x) (x).begin(), (x).end()
#define pii pair<int, int>
#define pb push_back
#define ll long long
#define F first
#define S second
const ll inf = 1e18, mod = 1e9 + 7, delta = 1e9 + 9, SQ = 450, P = 6065621;
 
using namespace std;

const ll N = 20, LG = 20;
vector<int> vec[N];
set<int> adj[N];
int k[N], dp[N], n;
ll ans = inf;

void dfs (int v) {
  dp[v] = 1;
  for (auto u: adj[v]) {
    dfs(u);
    dp[v] += dp[u];
  }
}

void bt (int v, int x = 1) {
  if (x == n + 1) {
    if (!adj[v].size()) return;
    dfs(v);
    ll sum = 0;
    for (int i = 1; i <= n; i++)
      sum += dp[i];
    if (sum < ans) {
      ans = sum;
      // for (int i = 1; i <= n; i++) {
      //   cout << i << ": ";
      //   for (auto u: adj[i]) cout << u << ' ';
      //   cout << '\n';
      // }
      // cout << '\n';
    }
  }
  if (x == v) {
    bt(v, x + 1);
    return;
  }
  if (!k[x]) return;
  for (int i = 0; i < k[x]; i++) {
    if (adj[vec[x][i]].count(x) || adj[x].count(vec[x][i])) continue;
    adj[vec[x][i]].insert(x);
    bt(v, x + 1);
    adj[vec[x][i]].erase(x);
  }
}

int main() {
  fast_io;
  cin >> n;
  for (int i = 1; i <= n; i++) {
    cin >> k[i];
    for (int j = 1; j <= k[i]; j++) {
      int x;
      cin >> x;
      vec[i].pb(x);
    }
  }
  for (int i = 1; i <= n; i++) {
    for (int i = 1; i <= n; i++)
      adj[i].clear();
    bt(i);
  }
  cout << ans << '\n';
  return 0;
}

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33