Submission #813288

#	Time	Username	Problem	Language	Result	Execution time	Memory
813288		trucmai	Bosses (BOI16_bosses)	C++17	100 / 100	476 ms	24068 KiB

bosses

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

#ifdef LOCAL
  #include "/home/trucmai/.vim/tools.h"
  #define debug(x...) cerr << "\e[91m"<<__func__<<":"<<__LINE__<<" [" << #x << "] = ["; _print(x); cerr << "\e[39m" << endl;
  #else
  #define debug(x...)
#endif

void open(){
  if(fopen("i.inp","r")){
    freopen("i.inp","r",stdin);
    freopen("o.out","w",stdout);
  }
}

#define ll long long
#define all(a) (a).begin(), (a).end()
#define vi vector<ll>
#define pi pair<ll,ll>
#define pii pair<ll,pair<ll,ll>>
#define fi first
#define se second
#define gcd __gcd
#define mset(a,v) memset(a, v, sizeof(a))
#define endl '\n'
#define spc " "

const int MN = 1e6 + 5,LOG = 27;
const ll MOD = 1e9 + 7,INF = 1e9;
ll n; vector<ll>g[MN];
ll bfs(ll root){
  queue<ll>qu; ll res = 0;
  vector<ll>h(n+1,0); vector<bool>vis(n+1,false); 
  h[root] = 1; qu.push(root); vis[root] = true; 
  while(!qu.empty()){
    ll u = qu.front(); qu.pop();
    res += h[u]; 
    for(ll &v : g[u]){
      if(vis[v]) continue; 
      h[v] = h[u] + 1; 
      vis[v] = true;
      qu.push(v);
    }
  }
  bool flag = true; 
  for(ll i = 1;i <= n;++i) flag &= vis[i]; 
  return (flag ? res : INF);
}
void solve(){
  cin>>n; 
  for(ll i = 1;i <= n;++i){
    ll k; cin>>k; 
    for(ll j = 1;j <= k;++j){
      ll x; cin>>x; 
      g[x].push_back(i);
    }
  }
  ll res = INF;
  for(ll r = 1;r <= n;++r) res = min(res,bfs(r));
  cout<<res<<endl;
}

signed main(){
  cin.tie(0) -> sync_with_stdio(0);
  open();
  ll t = 1; //cin>>t;
  while(t--) solve(); 
  
  #ifdef LOCAL
    cerr << endl << "Time elapsed: " << 1.0 * clock() / CLOCKS_PER_SEC << " s.\n";
  #endif
}

Compilation message (stderr)

bosses.cpp: In function 'void open()':
bosses.cpp:13:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   13 |     freopen("i.inp","r",stdin);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~
bosses.cpp:14:12: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   14 |     freopen("o.out","w",stdout);
      |     ~~~~~~~^~~~~~~~~~~~~~~~~~~~

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