oj.uz

Submission #888795

# Submission time Handle Problem Language Result Execution time Memory
888795 2023-12-18T07:55:14 Z vjudge1 Passport (JOI23_passport) C++17
0 / 100
 2 ms 10876 KB 
#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 = 0 ; i < n ; i ++ ){
		cin >> l[i] >> r[i] ;
		a[i].ff = l[i] , a[i].ss = r[i] ;
	}
	cin >> q >> x ;
	int r = 1 , cnt = 0 , i = 0 ;
	while ( r != n ){
		int cur = r ;
		for ( ; i < n ; i ++ ){
			if ( a[i].ff > r ) break ;
			chmax ( cur , a[i].ss ) ;
		}
		if ( cur == r ){
			cout << -1 ;
			return ;
		}
		r = cur ;
		cnt ++ ;
	}
	cout << cnt ;
}

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

Compilation message

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
0 / 6.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Incorrect 2 ms 10840 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Incorrect 2 ms 10876 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #3
0 / 24.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Incorrect 2 ms 10876 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 8.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Incorrect 2 ms 10876 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #5
0 / 46.0

# Verdict Execution time Memory Grader output
1 Correct 2 ms 10840 KB Output is correct
2 Incorrect 2 ms 10840 KB Output isn't correct
3 Halted 0 ms 0 KB -