Submission #888597

#	Time	Username	Problem	Language	Result	Execution time	Memory
888597		thunopro	Passport (JOI23_passport)	C++14	6 / 100	32 ms	5340 KiB

passport

#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 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 n ; 
pii a [maxn] ; 

bool is_query [maxn] ;

void sub1 () 
{
	priority_queue <int> S ; 
	for ( int i = 1 ; i <= a [1].se ; i ++ ) S.push(a[i].se) ; 
	int res = 1 ; 
	int cur = a[1].se ; 
	while ( !S.empty () ) 
	{
		int u = S.top() ; S.pop() ; 
		if ( cur >= u ) break ; 
		while ( cur < u ) S . push (a[++cur].se) ; 
		res ++ ; 
	}
	if ( cur >= n ) cout << res ; 
	else cout << -1 ; 
} 
int main () 
{
	ios_base::sync_with_stdio(0) ; 
	cin.tie(0) ; cout.tie(0) ; 
//	rf () ; 
	
	cin >> n ; 
	for ( int i = 1 ; i <= n ; i ++ ) cin >> a [i].fi >> a[i].se ; 
	
	int nq ; cin >> nq ; 
	for ( int i = 1 ; i <= nq ; i ++ ) 
	{
		int x ; cin >> x ; 
		is_query [x] = true ; 
	}
	
	if ( nq == 1 && is_query [1] == true ) sub1 () ; 
}

Compilation message (stderr)

passport.cpp: In function 'void rf()':
passport.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: 6 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46