This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include<bits/stdc++.h>
using namespace std ;
#define ll long long
#define maxn 200009
#define fi first
#define se second
#define pb push_back
#define left id<<1
#define right id<<1|1
#define re exit(0);
#define _lower(v,x) lower_bound(v.begin(),v.end(),x)-v.begin()+1
const int mod = 1e9+7 ;
const int INF = 1e9 ;
const int LOG = 18 ;
typedef vector<int> vi ;
typedef pair<int,int> pii ;
typedef vector<ll> vl ;
typedef vector<pii> vii ;
void add ( int &a , int b )
{
a += b ;
if ( a < 0 ) a += mod ;
if ( a >= mod ) a -= mod ;
}
template < typename T > void chkmin ( T &a , T b ) { if ( a > b ) a = b ; }
template < typename T > void chkmax ( T &a , T b ) { if ( a < b ) a = b ; }
void rf ()
{
freopen ("bai1.inp","r",stdin) ;
// freopen ("bai1.out","w",stdout) ;
}
int _pow ( int a , int n )
{
if ( n == 0 ) return 1 ;
int res = _pow (a,n/2) ;
if ( n % 2 ) return 1ll*res*res%mod*a%mod ;
else return 1ll*res*res%mod ;
}
int n ;
vi adjList [maxn] ;
int res = 1e9 ;
int dep [maxn] ;
int main ()
{
ios_base::sync_with_stdio(0);
cin.tie(0);cout.tie(0) ;
// rf () ;
cin >> n ;
for ( int i = 1 ; i <= n ; i ++ )
{
int num ; cin >> num ;
for ( int j = 1 ; j <= num ; j ++ )
{
int x ; cin >> x ;
adjList [x] . pb (i) ;
}
}
for ( int root = 1 ; root <= n ; root ++ )
{
memset ( dep , 0 , sizeof dep ) ;
dep [root] = 1 ;
queue <int> q ;
q . push (root) ;
while ( !q.empty() )
{
int u = q.front() ; q.pop() ;
for ( auto v : adjList [u] )
{
if ( dep [v] == 0 )
{
dep [v] = dep [u] + 1 ;
q.push(v) ;
}
}
}
int sum = 0 ;
for ( int i = 1 ; i <= n ; i ++ ) sum += dep [i] ;
res = min (res,sum) ;
}
cout << res ;
}
Compilation message (stderr)
bosses.cpp: In function 'void rf()':
bosses.cpp:34:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
34 | freopen ("bai1.inp","r",stdin) ;
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
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