Language: C++

#include<iostream>
#include<vector>
using namespace std;
bool check[3001];
int n,x,y,w[3001];
vector<int> point[3001];

bool dfs(int u,int f) {
	check[u]=false;
	for(int v:point[])if(v!=f&&w[v]<w[u]) {
			dfs(v,u);
			if(!check[v]) {
				check[u]=true;
				break;
		}
	}
}
int main() {
	cin>>n;
	for(int i=1;i<=n;i++)
		cin>>w+i;
	for(int i=1;i<n; i++)
		cin>>x>>y;
	point[x].push_back(y),point[y].push_back(x);
	for(int i=1;i<=n;i++) {
		dfs(i,0);
		if(check[i])
			cout<<i<<" ";
	}
	return 0;
}

Compiler output:
a.cc: In function 'bool dfs(int, int)':
a.cc:10:25: error: expected primary-expression before ']' token
   10 |         for(int v:point[])if(v!=f&&w[v]<w[u]) {
      |                         ^
a.cc:17:1: warning: no return statement in function returning non-void [-Wreturn-type]
   17 | }
      | ^
a.cc: In function 'int main()':
a.cc:21:20: error: no match for 'operator>>' (operand types are 'std::istream' {aka 'std::basic_istream<char>'} and 'int*')
   21 |                 cin>>w+i;
      |                 ~~~^~~~~
      |                 |     |
      |                 |     int*
      |                 std::istream {aka std::basic_istream<char>}
In file included from /usr/include/c++/14/iostream:42,
                 from a.cc:1:
/usr/include/c++/14/istream:170:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(bool&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  170 |       operator>>(bool& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:170:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: cannot bind non-const lvalue reference of type 'bool&' to a value of type 'int*'
   21 |                 cin>>w+i;
      |                      ~^~
/usr/include/c++/14/istream:174:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(short int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  174 |       operator>>(short& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:174:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'short int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(short int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'short int&'
/usr/include/c++/14/istream:177:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(short unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  177 |       operator>>(unsigned short& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:177:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'short unsigned int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(short unsigned int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'short unsigned int&'
/usr/include/c++/14/istream:181:7: note: candidate: 'std::basic_istream<_CharT, _Traits>& std::basic_istream<_CharT, _Traits>::operator>>(int&) [with _CharT = char; _Traits = std::char_traits<char>]' (near match)
  181 |       operator>>(int& __n);
      |       ^~~~~~~~
/usr/include/c++/14/istream:181:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'int&'
/usr/include/c++/14/istream:184:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  184 |       operator>>(unsigned int& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:184:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'unsigned int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(unsigned int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'unsigned int&'
/usr/include/c++/14/istream:188:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  188 |       operator>>(long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:188:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'long int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(long int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'long int&'
/usr/include/c++/14/istream:192:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  192 |       operator>>(unsigned long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:192:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'long unsigned int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(long unsigned int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'long unsigned int&'
/usr/include/c++/14/istream:199:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  199 |       operator>>(long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:199:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'long long int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(long long int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'long long int&'
/usr/include/c++/14/istream:203:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long long unsigned int&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  203 |       operator>>(unsigned long long& __n)
      |       ^~~~~~~~
/usr/include/c++/14/istream:203:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: invalid conversion from 'int*' to 'long long unsigned int' [-fpermissive]
   21 |                 cin>>w+i;
      |                      ~^~
      |                       |
      |                       int*
a.cc:21:23: error: cannot bind rvalue '(long long unsigned int)(((int*)(& w)) + ((sizetype)(((long unsigned int)i) * 4)))' to 'long long unsigned int&'
/usr/include/c++/14/istream:328:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(void*&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]' (near match)
  328 |       operator>>(void*& __p)
      |       ^~~~~~~~
/usr/include/c++/14/istream:328:7: note:   conversion of argument 1 would be ill-formed:
a.cc:21:23: error: cannot bind non-const lvalue reference of type 'void*&' to an rvalue of type 'void*'
   21 |                 cin>>w+i;
      |                      ~^~
/usr/include/c++/14/istream:219:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(float&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  219 |       operator>>(float& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:219:25: note:   no known conversion for argument 1 from 'int*' to 'float&'
  219 |       operator>>(float& __f)
      |                  ~~~~~~~^~~
/usr/include/c++/14/istream:223:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  223 |       operator>>(double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:223:26: note:   no known conversion for argument 1 from 'int*' to 'double&'
  223 |       operator>>(double& __f)
      |                  ~~~~~~~~^~~
/usr/include/c++/14/istream:227:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(long double&) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  227 |       operator>>(long double& __f)
      |       ^~~~~~~~
/usr/include/c++/14/istream:227:31: note:   no known conversion for argument 1 from 'int*' to 'long double&'
  227 |       operator>>(long double& __f)
      |                  ~~~~~~~~~~~~~^~~
/usr/include/c++/14/istream:122:7: note: candidate: 'std::basic_istream<_CharT, _Traits>::__istream_type& std::basic_istream<_CharT, _Traits>::operator>>(__istream_type& (*)(__istream_type&)) [with _CharT = char; _Traits = std::char_traits<char>; __istream_type = std::basic_istream<char>]'
  122 |       operator>>(__istream_type& (*__pf)(__istream_type&))
      |       ^~~~~~~~
/usr/include/c++/14/istream:122:36: note:   no known conversion for argument 1 from 'int*' to 'std::basic_istream<char>::__istream_type& (*)(std::basic_istream<char>::__istream_type&)' {aka 'std::basic_istream<char>& (*)(std::basi