Language: C++

#include<bits/stdc++.h>

using namespace std;

int main(){
  int N;
  cin >> N;
    
  queue<long, std::vector<long>, std::greater<long>> q;
  q.push(1);
  q.push(2);
  q.push(3);
  q.push(4);
  q.push(5);
  q.push(6);
  q.push(7);
  q.push(8);
  q.push(9);

  for(int i=0; i<K-1; i++){
    long cur = q.top();
    q.pop();
    if(cur % 10 != 0) q.push((long)10*cur -1);
    q.push((long)10*cur);
    if(cur % 10 != 9) q.push((long)10*cur +1);
  }
  
  cout << q.front();
  return 0; 
}

Compiler output:
a.cc: In function 'int main()':
a.cc:9:51: error: wrong number of template arguments (3, should be at least 1)
    9 |   queue<long, std::vector<long>, std::greater<long>> q;
      |                                                   ^~
In file included from /usr/include/c++/14/queue:66,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:157,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_queue.h:96:11: note: provided for 'template<class _Tp, class _Sequence> class std::queue'
   96 |     class queue
      |           ^~~~~
a.cc:10:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   10 |   q.push(1);
      |     ^~~~
a.cc:11:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   11 |   q.push(2);
      |     ^~~~
a.cc:12:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   12 |   q.push(3);
      |     ^~~~
a.cc:13:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   13 |   q.push(4);
      |     ^~~~
a.cc:14:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   14 |   q.push(5);
      |     ^~~~
a.cc:15:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   15 |   q.push(6);
      |     ^~~~
a.cc:16:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   16 |   q.push(7);
      |     ^~~~
a.cc:17:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   17 |   q.push(8);
      |     ^~~~
a.cc:18:5: error: request for member 'push' in 'q', which is of non-class type 'int'
   18 |   q.push(9);
      |     ^~~~
a.cc:20:18: error: 'K' was not declared in this scope
   20 |   for(int i=0; i<K-1; i++){
      |                  ^
a.cc:21:18: error: request for member 'top' in 'q', which is of non-class type 'int'
   21 |     long cur = q.top();
      |                  ^~~
a.cc:22:7: error: request for member 'pop' in 'q', which is of non-class type 'int'
   22 |     q.pop();
      |       ^~~
a.cc:23:25: error: request for member 'push' in 'q', which is of non-class type 'int'
   23 |     if(cur % 10 != 0) q.push((long)10*cur -1);
      |                         ^~~~
a.cc:24:7: error: request for member 'push' in 'q', which is of non-class type 'int'
   24 |     q.push((long)10*cur);
      |       ^~~~
a.cc:25:25: error: request for member 'push' in 'q', which is of non-class type 'int'
   25 |     if(cur % 10 != 9) q.push((long)10*cur +1);
      |                         ^~~~
a.cc:28:13: error: request for member 'front' in 'q', which is of non-class type 'int'
   28 |   cout << q.front();
      |             ^~~~~