제출 #1137293

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
1137293		thunopro	기지국 (IOI20_stations)	C++20	100 / 100	310 ms	5260 KiB

stations

#include<bits/stdc++.h>
using namespace std ; 
#define maxn 200009
#define ll long long 
#define pb push_back 
#define fi first 
#define se second 
#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 
#define TIME ( 1.0*clock() / CLOCKS_PER_SEC )
const int mod = 1e9+7 ;
const int INF = 1e9 ; 

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

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

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

mt19937 rng (time(0)) ; 

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 ; 
}

vi label ( int n , int k , vi u , vi v ) ; 
int find_next_station ( int s , int t , vi c ) ; 

vi adjList [maxn] ; 
vi Label ; 
int timeDfs ; 

void dfs ( int u , int par , int len ) 
{
	if ( !len ) Label [u] = ++ timeDfs ; 
	for ( auto v : adjList [u] ) if ( v != par ) dfs (v,u,len^1) ; 
	if ( len ) Label [u] = ++ timeDfs ; 
}

void reset ( int n ) 
{
	for ( int i = 0 ; i < n ; i ++ ) adjList [i] . clear () ; 
	timeDfs = 0 ; 
	Label . clear () ; 
}

vi label ( int n , int k , vi u , vi v ) 
{
	reset (n) ; 
	for ( int i = 0 ; i < n-1 ; i ++ ) 
	{
		adjList [u[i]] . pb (v[i]) ; 
		adjList [v[i]] . pb (u[i]) ; 
	}
	Label.resize (n) ; 
	dfs (0,0,0) ; 
	return Label ; 
}

int find_next_station ( int s , int t , vi c ) 
{
	if ( c [0] < s ) 
	{
		if ( s < t || t < c [0] ) return c [0] ; 
		return c[upper_bound(c.begin(),c.end(),t)-c.begin()-1] ; 
	}
	if ( c.back () < t || t < s ) return c.back () ; 
	return c[lower_bound(c.begin(),c.end(),t)-c.begin()] ; 
}

//int main () 
//{
//	ios_base::sync_with_stdio(0); 
//	cin.tie(0);cout.tie(0); 
////	rf () ;
//	
//}

컴파일 시 표준 에러 (stderr) 메시지

stations.cpp: In function 'void rf()':
stations.cpp:32:17: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   32 |         freopen ("bai1.inp","r",stdin) ;
      |         ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 5 / 5
• Subtask 2: 8 / 8
• Subtask 3: 16 / 16
• Subtask 4: 10 / 10
• Subtask 5: 61 / 61