제출 #891084

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
891084		vjudge1	Jail (JOI22_jail)	C++17	0 / 100	29 ms	96860 KiB

jail

#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(){YES(1);}
void NO(){YES(0);}
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 = 2e6 + 5 ;
const int inf = 1e18 ;
const int mod = 998244353 ;
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 , m , ans , p ;
bool f ;
int a[N] , b[N] ;
vector <int> g[N] , vis[N] ;
pii c[N] ;

bool dfs ( int v , int p , int x , int i ){
	if ( v == x ){
		vis[x].push_back(i) ;
		return 1 ;
	}
	for ( auto to : g[v] ) if ( to != p && dfs ( to , v , x , i ) ){ vis[v].push_back(i) ; return 1 ;}
	return 0 ;
}

void solve(){
	f = 0 ;
	cin >> n ;
	for ( int i = 1 ; i <= n ; i ++ ) g[i].clear() , vis[i].clear() ;
	for ( int i = 1 ; i < n ; i ++ ){
		int x , y ; cin >> x >> y ;
		f &= ( x == i && y == x+1 ) ;
		g[x].push_back(y) ;
		g[y].push_back(x) ;
	}
	cin >> m ;
	for ( int i = 0 ; i < m ; i ++ ) cin >> a[i] >> b[i] ;
	if (f){
		for ( int i = 0 ; i < m ; i ++ ) c[i].ff = a[i] , c[i].ss = b[i] ;
		sort ( c , c + m ) ;
		set <int> st ;
		for ( int i = 0 ; i < m ; i ++ ) st.insert(b[i]) ;
		for ( int i = 0 ; i < m ; i ++ ){
			st.erase(c[i].ss) ;
			if ( c[i].ss < c[i].ff ) continue ;
			if ( st.upper_bound(min(c[i].ff,c[i].ss)) != st.end() && *st.upper_bound(min(c[i].ff,c[i].ss)) < max ( c[i].ff , c[i].ss ) ){
				NO() ;
				return ;
			}
		}
		YES() ;
	}
	for ( int i = 0 ; i < m ; i ++ ){
		dfs ( a[i] , 0 , b[i] , i ) ;
	}
	if ( vis[b[0]].size() > 1 && vis[b[1]].size() > 1 ) NO() ;
	else if ( ( vis[a[0]].size() == 2 && vis[b[0]].size() == 2 ) || ( vis[a[1]].size() == 2 && vis[b[1]].size() == 2 ) ) NO() ;
	else YES() ;
}

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

컴파일 시 표준 에러 (stderr) 메시지

jail.cpp: In function 'void fopn(std::string)':
jail.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);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jail.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 / 5
• Subtask 2: 0 / 5
• Subtask 3: 0 / 16
• Subtask 4: 0 / 28
• Subtask 5: 0 / 12
• Subtask 6: 0 / 11
• Subtask 7: 0 / 23