Submission #888793

#	Time	Username	Problem	Language	Result	Execution time	Memory
888793		vjudge1	Passport (JOI23_passport)	C++17	6 / 100	97 ms	11344 KiB

passport

#include <bits/stdc++.h>
//#include <ext/pb_ds/assoc_container.hpp>
//#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
//using namespace __gnu_pbds;

bool YES(bool f){ if(f) cout << "Yes\n" ; else cout << "No\n" ; return f ; }
void YES(){cout << "Yes\n" ;}
void NO(){cout << "No\n" ;}
void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
//#define ordered_set tree<int, null_type,less_equal<int>, rb_tree_tag,tree_order_statistics_node_update>
#define ios ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0);
#define int long long
#define ld long double
#define pii pair <int , int>
#define ff first
#define ss second
#define endl '\n'

const int N = 2e5 + 5 ;
const int inf = 1e18 ;
const int mod = 1e9 + 7 ;
const double eps = 1e-8 ;

int binpow( int a , int b ){
  if ( b == 0 ) return 1 ;
  int x = binpow ( a , b/2 ) ;
  if ( !(b%2) ) return (x*x) ;
  return (x*x*a) ;
}
template <class T>
bool chmax( T& x , const T& y ){
  bool f = 0 ;
  if ( x < y ) x = y , f = 1 ;
  return f ;
}
template <class T>
bool chmin( T &x , const T &y ){
  bool f = 0 ;
  if ( x > y ) x = y , f = 1 ;
  return f ;
}

//code

int n , q , x ;
int l[N] , r[N] ;
pii a[N] ;
vector <int> vec[N] ;

void solve(){
	
	cin >> n ;
	for ( int i = 1 ; i <= n ; i ++ ){
		cin >> l[i] >> r[i] ;
		a[i].ff = l[i] , a[i].ss = r[i] ;
	}
	cin >> q >> x ;
	int r = a[x].ss , cnt = 1 , l = a[x].ff ;
	while ( r != n ){
		int cur = r ;
		for ( int i = l ; i <= r ; i ++ ) chmax ( cur , a[i].ss ) ;
		if ( cur == r ){
			cout << -1 ;
			return ;
		}cnt ++ ;
		l = r ; r = cur ;
	}
	cout << cnt ;
}

signed main(){
    //ios ;
	int t = 1 ;
	//cin >> t ;
	while ( t -- ) solve() ;
}

Compilation message (stderr)

passport.cpp: In function 'void fopn(std::string)':
passport.cpp:10:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
passport.cpp:10:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   10 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 6 / 6
• Subtask 2: 0 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 8
• Subtask 5: 0 / 46