#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
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) ;
}
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 query ( vi v ) ;
//int solve ( vi v ) ;
//int findEgg ( int N , vii bridges ) ;
//int main ()
//{
// ios_base::sync_with_stdio(0);
// cin.tie(0);cout.tie(0);
//// rf () ;
// int n ;
// vii bridges ;
// cin >> n ;
// for ( int i = 1 ; i < n ; i ++ )
// {
// int u , v ; cin >> u >> v ;
// bridges . pb ({u,v}) ;
// }
// cout << findEgg (n,bridges) ;
//}
//
//int query ( vi v )
//{
// for ( auto x : v ) cerr << x << "\n" ;
// int z ; cin >> z ;
// return z ;
//}
#include "grader.h"
int n ; vi adjList [maxn] ;
vi L ;
void dfs ( int u , int par = -1 )
{
L . pb (u) ;
for ( auto v : adjList [u] )
{
if ( v == par ) continue ;
dfs (v,u) ;
}
}
int findEgg ( int N , vii bridges )
{
n = N ;
for ( int i = 1 ; i <= n ; i ++ ) adjList[i].clear() ;
for ( auto x : bridges ) adjList[x.fi] . pb (x.se) , adjList[x.se] . pb (x.fi) ;
dfs (1) ;
int l = 0 , r = n-2 , res ;
while ( l <= r )
{
int mid = (l+r)/2 ;
if ( query(vi(L.begin(),L.end()+mid+1))) r = mid-1 , res = mid ;
else l = mid+1 ;
}
return L[res] ;
}
Compilation message
eastereggs.cpp: In function 'void rf()':
eastereggs.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) ;
| ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
eastereggs.cpp: In function 'int findEgg(int, vii)':
eastereggs.cpp:94:14: warning: 'res' may be used uninitialized in this function [-Wmaybe-uninitialized]
94 | return L[res] ;
| ^
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
5 ms |
10000 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
5 ms |
10020 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
| # |
Verdict |
Execution time |
Memory |
Grader output |
| 1 |
Runtime error |
5 ms |
10052 KB |
Execution killed with signal 6 |
| 2 |
Halted |
0 ms |
0 KB |
- |
