Submission #790729

#	Time	Username	Problem	Language	Result	Execution time	Memory
790729		christinelynn	Bosses (BOI16_bosses)	C++17	0 / 100	5 ms	9696 KiB

bosses

#include<bits/stdc++.h>

#define pb push_back
#define int long long
#define INF 1e18
#define endl '\n'
 
using namespace std;

int n , k , ans = 1e18 , ttl = 0;
vector < int > adj[200005];
vector < int > tree[200005];
bool vis[200005];

int dfs(int cur){
  int tt = 1;
  for(int u : tree[cur]){
    tt += dfs(u);
  }
  ttl += tt;
  return tt;
}

void bfs(int s){
  queue < int > q;
  vis[s] = true;
  q.push(s);
  while(!q.empty()){
    int u = q.front(); q.pop();
    for(int i : adj[u]){
      if(!vis[i]){
        vis[i] = true;
        q.push(i);
        tree[u].pb(i);
      }
    }
  }
  ttl = 0;
  int tmp = dfs(s);
  //cout << s << " " << ttl << endl;
  ans = min(ans , ttl);
}

signed main(){
  cin >> n;
  for(int i = 1 ; i <= n ; i++){
    cin >> k;
    for(int j = 1 ; j <= k ; j++){
      int tmp; cin >> tmp;
      adj[tmp].pb(i);
    }
  }
  for(int i = 1 ; i <= n ; i++){
    for(int j = 1 ; j <= n ; j++){
      vis[j] = false;
      tree[j].clear();
    }
    bfs(i);
  }
  cout << ans << endl;
}

Compilation message (stderr)

bosses.cpp: In function 'void bfs(long long int)':
bosses.cpp:39:7: warning: unused variable 'tmp' [-Wunused-variable]
   39 |   int tmp = dfs(s);
      |       ^~~

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