Language: C++

#include<bits/stdc++.h>
using namespace std;

struct vw{int v1; int w1;}
vector<int> color(N+1);
vector<bool> used(N+1);


void f(int u)
{
  if(used.at(u))return;
  used.at(u)=1;
  for(int go,int w:tree.at(u))
  {
    if(w%2==1){
      if(color.at(to)==1){color.at(u)=0;}
      if(color.at(to)==0){color.at(u)=1;}
       }
    else{color.at(to)=color.at(u);}
  }
  f(to);
}



int main()
{
  int N;
  cin>>N;
  vector<vector<int>>tree(N,vw);
  for(int i=0;i<N;i++)
  {
    int ux,vx,wx;
    cin>>ux>>vx>>wx;
    tree.at(ux).vm={vx,wx};
    tree.at(vx).w1={ux,wx};
  }
f(1);
for(int i=0;i<N;i++){  
  cout<<iro.at(i+1)<<endl;
  }
}

Compiler output:
a.cc:5:13: error: invalid declarator before 'color'
    5 | vector<int> color(N+1);
      |             ^~~~~
a.cc:6:19: error: 'N' was not declared in this scope
    6 | vector<bool> used(N+1);
      |                   ^
a.cc: In function 'void f(int)':
a.cc:13:14: error: expected unqualified-id before 'int'
   13 |   for(int go,int w:tree.at(u))
      |              ^~~
a.cc:13:14: error: expected ';' before 'int'
   13 |   for(int go,int w:tree.at(u))
      |              ^~~
      |              ;
a.cc:13:19: error: found ':' in nested-name-specifier, expected '::'
   13 |   for(int go,int w:tree.at(u))
      |                   ^
      |                   ::
a.cc:13:18: error: 'w' has not been declared
   13 |   for(int go,int w:tree.at(u))
      |                  ^
a.cc:13:24: error: qualified-id in declaration before '.' token
   13 |   for(int go,int w:tree.at(u))
      |                        ^
a.cc:13:30: error: expected ';' before ')' token
   13 |   for(int go,int w:tree.at(u))
      |                              ^
      |                              ;
a.cc:15:8: error: 'w' was not declared in this scope
   15 |     if(w%2==1){
      |        ^
a.cc:16:10: error: 'color' was not declared in this scope
   16 |       if(color.at(to)==1){color.at(u)=0;}
      |          ^~~~~
a.cc:16:19: error: 'to' was not declared in this scope; did you mean 'go'?
   16 |       if(color.at(to)==1){color.at(u)=0;}
      |                   ^~
      |                   go
a.cc:17:10: error: 'color' was not declared in this scope
   17 |       if(color.at(to)==0){color.at(u)=1;}
      |          ^~~~~
a.cc:17:19: error: 'to' was not declared in this scope; did you mean 'go'?
   17 |       if(color.at(to)==0){color.at(u)=1;}
      |                   ^~
      |                   go
a.cc:19:10: error: 'color' was not declared in this scope
   19 |     else{color.at(to)=color.at(u);}
      |          ^~~~~
a.cc:19:19: error: 'to' was not declared in this scope; did you mean 'go'?
   19 |     else{color.at(to)=color.at(u);}
      |                   ^~
      |                   go
a.cc:21:5: error: 'to' was not declared in this scope; did you mean 'tm'?
   21 |   f(to);
      |     ^~
      |     tm
a.cc: In function 'int main()':
a.cc:30:31: error: expected primary-expression before ')' token
   30 |   vector<vector<int>>tree(N,vw);
      |                               ^
a.cc:35:17: error: '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> >, std::vector<int> >::value_type' {aka 'class std::vector<int>'} has no member named 'vm'
   35 |     tree.at(ux).vm={vx,wx};
      |                 ^~
a.cc:36:17: error: '__gnu_cxx::__alloc_traits<std::allocator<std::vector<int> >, std::vector<int> >::value_type' {aka 'class std::vector<int>'} has no member named 'w1'
   36 |     tree.at(vx).w1={ux,wx};
      |                 ^~
a.cc:40:9: error: 'iro' was not declared in this scope
   40 |   cout<<iro.at(i+1)<<endl;
      |         ^~~