Submission #894641

#	Time	Username	Problem	Language	Result	Execution time	Memory
894641		thunopro	Making Friends on Joitter is Fun (JOI20_joitter2)	C++14	1 / 100	320 ms	596 KiB

joitter2

#include<bits/stdc++.h>
using namespace std ;
#define maxn 200009 
#define ll long long
#define fi first 
#define se second 
#define pb push_back 
#define left id<<1
#define right id<<1|1 
#define _lower(v,x) lower_bound(v.begin(),v.end(),x)-v.begin()+1 
#define re exit(0); 

const int mod = 1e9+7 ; 
const int INF = 1e9 ; 
const int LOG = 18 ; 

typedef vector<int> vi ; 
typedef vector<ll> vl ; 
typedef pair<int,int> pii ; 
typedef vector<pii> vii ; 
typedef pair<ll,ll> pll ;  

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 , m ; 

bool adj [59][59] ; 
void sub1 () 
{
	int res = 0 ; 
	for ( int r = 1 ; r <= m ; r ++ ) 
	{
		int u , v ; cin >> u >> v ; 
		if ( adj [u][v] )
		{
			cout << res << "\n" ; 
			continue ;
		} 
		res ++ ; 
		adj [u][v] = 1 ; 
		while ( true ) 
		{
			bool change = false ; 
			for ( int i = 1 ; i <= n && !change ; i ++ ) 
			{
				for ( int j = 1 ; j <= n && !change; j ++ ) 
				{
					if ( i == j ) continue ; 
					for ( int k = 1 ; k <= n && !change ; k ++ ) 
					{
						if ( k == i || k == j ) continue ; 
						if ( adj [i][k] == 0 && adj [i][j] == 1 && adj [j][k] + adj [k][j] == 2 ) 
						{
							adj [i][k] = 1 ; change = true ; 
							res ++ ; 
						}
					}
				}
			}
			if ( ! change ) break ; 
		}
		cout << res << "\n" ; 
	}
}
int main () 
{
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; cout.tie(0) ; 
//	rf () ; 
	cin >> n >> m ; 
	
	if ( n <= 50 ) sub1 () ; 

}

Compilation message (stderr)

joitter2.cpp: In function 'void rf()':
joitter2.cpp:35:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 1 / 1
• Subtask 2: 0 / 16
• Subtask 3: 0 / 83