Submission #896712

#	Time	Username	Problem	Language	Result	Execution time	Memory
896712		thunopro	Advertisement 2 (JOI23_ho_t2)	C++14	100 / 100	261 ms	20104 KiB

Main

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 500009 
#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);
#define _lower(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<pii> vii ;
typedef vector<ll> vl ;  
typedef pair<ll,ll> pll ; 
typedef vector<pll> vll ; 

void add ( int&a , int b ) { if ((a+=b) > mod ) a -= mod ; } 
void sub ( int&a , int b ) { if ((a-=b) < 0 ) a += mod ; } 
template<typename T> void chkmin(T& x, T y) {if(x > y) x = y;}
template<typename T> void chkmax(T& x, T y) {if(x < y) x = y;}

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 ;  
struct shape {
	int x , h , fac_x ; 
} a [maxn] ; 

void mapping () 
{
	vi v ; 
	for ( int i = 1 ; i <= n ; i ++ ) v . pb (a[i].x) ; 
	sort(v.begin(),v.end()) ; 
	v.resize(unique(v.begin(),v.end())-v.begin()) ; 
	for ( int i = 1 ; i <= n ; i ++ ) a [i].fac_x = _lower(a[i].x) ; 
}

int bit1 [maxn] , bit2 [maxn] ; 

void update_bit1 ( int x , int y ) 
{
	while ( x ) chkmax (bit1[x],y) , x -= (x&-x) ; 
}
int get_bit1 ( int x ) 
{
	int res = -2e9 ; 
	while ( x < maxn ) chkmax (res,bit1[x]) , x += (x&-x) ; 
	return res ; 
}
void update_bit2 ( int x , int y ) 
{
	while ( x < maxn ) chkmax (bit2[x],y) , x += (x&-x) ;
}
int get_bit2 ( int x ) 
{
	int res = -2e9 ; 
	while ( x ) chkmax (res,bit2[x]) , x -= (x&-x) ; 
	return res ; 
}

bool cmp_h ( shape u , shape v ) 
{
	return u.h > v.h ; 
}
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].x >> a [i].h ; 
	
	mapping () ; 
	sort (a+1,a+n+1,cmp_h) ; 
	
	int res = 0 ; 
	
	memset ( bit1 , -0x3f , sizeof bit1 ) ; 
	memset ( bit2 , -0x3f , sizeof bit2 ) ; 
	
	for ( int i = 1 ; i <= n ; i ++ ) 
	{
		int x = a[i].x , h = a[i].h , fac_x = a[i].fac_x ; 
		
		bool ok = false ; 
	
		if ( get_bit1 (fac_x) >= h - x ) ok |= true ; 
		if ( get_bit2 (fac_x) >= h + x ) ok |= true ; 
		
		res += (!ok) ; 
		
		update_bit1 (fac_x,h-x) ; 
		update_bit2 (fac_x,h+x) ; 
	
	}
	
	cout << res ; 
}




//-std=c++11 
// check special 
// range , time , error , stay hard stay hard 
// there is no tomorrow 

Compilation message (stderr)

Main.cpp: In function 'void rf()':
Main.cpp:31:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   31 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 23 / 23
• Subtask 3: 36 / 36
• Subtask 4: 31 / 31