Submission #895453

#	Time	Username	Problem	Language	Result	Execution time	Memory
895453		thunopro	Bosses (BOI16_bosses)	C++14	100 / 100	488 ms	6228 KiB

bosses

#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] ; 
			if ( dep [i] == 0 ) sum = 1e9 ; 
		}
		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) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

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