제출 #922306

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
922306		thunopro	돌 무게 재기 (IZhO11_stones)	C++14	100 / 100	35 ms	7768 KiB

stones

#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; 

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

void add ( int &a , int b ) 
{
	a += b ; 
	if ( a > mod ) a -= mod ; 
	if ( a < 0 ) 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 ; }

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 ; 
}

void rf () 
{
	freopen ("bai1.inp","r",stdin) ;
}

int n ; 
pii T [maxn*4] ; 
int lazy [maxn*4] ; 
void down ( int id ) 
{
	int &t = lazy [id] ; 
	T [left].fi += t , T [right].fi += t ;
	T [left].se += t , T [right].se += t ;  
	lazy [left] += t , lazy [right] += t ; 
	t = 0 ; 
}

void update ( int id , int l , int r , int u , int v , int w )  
{
	if ( l > v || r < u ) return ; 
	if ( u <= l && r <= v ) 
	{
		T [id].fi += w , T [id].se += w ; 
		lazy [id] += w ; 
		return ; 
	}
	int mid = (l+r)/2 ; 
	down (id) ; 
	update (left,l,mid,u,v,w) ; 
	update (right,mid+1,r,u,v,w) ; 
	T [id].fi = min (T[left].fi,T[right].fi) ; 
	T [id].se = max (T[left].se,T[right].se) ; 
}

int main () 
{
	ios_base::sync_with_stdio(0); 
	cin.tie(0);cout.tie(0); 
//	rf () ; 
	cin >> n ; 
	
	for ( int i = 1 ; i <= n ; i ++ ) 
	{
		int r , s ; cin >> r >> s ; 
		if ( s == 1 ) update (1,1,n,1,r,1) ; 
		else update (1,1,n,1,r,-1) ;
		if ( T[1].fi >= 0 ) cout << ">\n" ; 
		else if ( T[1].se <= 0 ) cout << "<\n" ; 
		else cout << "?\n" ;  
	}
	
	
}

컴파일 시 표준 에러 (stderr) 메시지

stones.cpp: In function 'void rf()':
stones.cpp:40:10: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   40 |  freopen ("bai1.inp","r",stdin) ;
      |  ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 100 / 100