Submission #672434

#	Time	Username	Problem	Language	Result	Execution time	Memory
672434		Cutebol	Birthday gift (IZhO18_treearray)	C++17	0 / 100	5 ms	9812 KiB

treearray

#include <bits/stdc++.h>
 
using namespace std;
 
void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
#define Scaramouche ios_base::sync_with_stdio(0) ; cin.tie(0) ; cout.tie(0);
#define int long long
#define itn int
#define endl "\n"
#define ff first
#define ss second
   
const int N = 2e5 + 5 ;
const int mod = 1e9 + 7 ;
const int inf = 1e12 ;

int n , m , q , l = 1 , timer ;
int prv[N] , tin[N] , tout[N] , a[N] ;
vector <int> g[N] , up[N] ;

void dfs( int v , int p = 1 ){
	tin[v] = ++timer ;
	up[v][0] = p ;
	for ( int i = 1 ; i <= l ; i ++ ) up[v][i] = up[up[v][i-1]][i-1] ;
	for ( auto to : g[v] ){
		if ( to != p ) dfs(to ,v) ;
	}
	tout[v] = ++ timer ;
}

bool upper( int a , int b ){
	return tin[a] <= tin[b] && tout[a] >= tout[b] ;
}
int lca ( int a , int b ){
	if ( upper(a,b) ) return a ;
	if ( upper(b,a) ) return b ;
	for ( int i = l ; i >= 0 ; i -- )
		if ( !upper(up[a][i] , b) ) a = up[a][i] ;
	return up[a][0] ;
}

void solve(){
	
	cin >> n >> m >> q ;
	while ( ( 1 << l ) <= n ) l ++ ;
	for ( int i = 0 ; i <= n ; i ++ ) up[i].resize(n) ;
	for ( int i = 0 ; i < n - 1 ; i ++ ){
		int x , y ;
		cin >> x >> y ;
		g[x].push_back(y) ;
		g[y].push_back(x) ;
	}
	for ( int i = 0 ; i < m ; i ++ ) cin >> a[i] ;
	dfs(1) ;
	for ( int i = 0 ; i < n ; i ++ ){
		if ( i ) prv[i] = lca(a[i] , a[i-1]) ;
		else prv[i] = -1 ;
	}
	while ( q -- ){
		int tt ;
		cin >> tt ;
		if ( tt == 1 ){
			int ind , val ;
			cin >> ind >> val ;
			ind -- ;
			a[ind] = val ;
			if (ind) prv[ind] = lca ( a[ind] , a[ind-1] ) ;
		}
		else{
			bool f = 0 ;
			int l , r , v ;
			cin >> l >> r >> v ;
			l -- , r -- ;
			for ( int i = l ; i <= r; i ++ ){
				if ( a[i] == v ){
					cout << i+1 << ' ' << i+1 << endl ;
					f = 1 ;
					break ;
				}
			}
			if ( f ) continue ;
			for ( int i = l+1 ; i <= r ; i ++ ){
				if ( prv[i] == v ){
					cout << i << ' ' << i+1 << endl ;
					f = 1 ;
					break ;
				}
			}
			if ( f ) continue ;
			cout << -1 << ' ' << -1 << endl ;
		}
	}
}
 
signed main(){
//  fopn("blocks") ;
    Scaramouche ;
    int t = 1 ;
//      cin >> t ;
    while ( t -- ) solve() ; 
}

Compilation message (stderr)

treearray.cpp: In function 'void fopn(std::string)':
treearray.cpp:5:31: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                        ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
treearray.cpp:5:72: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
    5 | void fopn(string name){freopen((name+".in").c_str(),"r",stdin); freopen((name+".out").c_str(),"w",stdout);}
      |                                                                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 12
• Subtask 2: 0 / 18
• Subtask 3: 0 / 26
• Subtask 4: 0 / 44