/in/foo.cc:6:27: error: 'flase' was not declared in this scope
 vector<bool> visited(1<<n,flase); // 记录已访问的状态 
                           ^~~~~
/in/foo.cc: In function 'void bfs()':
/in/foo.cc:14:8: error: expected unqualified-id before '[' token
   auto [current, cnt] = q.front();
        ^
/in/foo.cc:16:6: error: 'current' was not declared in this scope
   if(current == target){
      ^~~~~~~
/in/foo.cc:17:12: error: 'cnt' was not declared in this scope
    cout << cnt << endl;
            ^~~
/in/foo.cc:21:15: error: 'current' was not declared in this scope
    int next = current;
               ^~~~~~~
/in/foo.cc:27:14: error: no match for 'operator[]' (operand types are 'std::vector<bool>' and '<unresolved overloaded function type>')
   if(!visited[next]){
              ^
In file included from /usr/include/c++/6/vector:65:0,
                 from /usr/include/c++/6/queue:61,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:86,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_bvector.h:854:5: note: candidate: std::vector<bool, _Alloc>::reference std::vector<bool, _Alloc>::operator[](std::vector<bool, _Alloc>::size_type) [with _Alloc = std::allocator<bool>; std::vector<bool, _Alloc>::reference = std::_Bit_reference; std::vector<bool, _Alloc>::size_type = long unsigned int]
     operator[](size_type __n)
     ^~~~~~~~
/usr/include/c++/6/bits/stl_bvector.h:854:5: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to 'std::vector<bool>::size_type {aka long unsigned int}'
/usr/include/c++/6/bits/stl_bvector.h:861:5: note: candidate: std::vector<bool, _Alloc>::const_reference std::vector<bool, _Alloc>::operator[](std::vector<bool, _Alloc>::size_type) const [with _Alloc = std::allocator<bool>; std::vector<bool, _Alloc>::const_reference = bool; std::vector<bool, _Alloc>::size_type = long unsigned int]
     operator[](size_type __n) const
     ^~~~~~~~
/usr/include/c++/6/bits/stl_bvector.h:861:5: note:   no known conversion for argument 1 from '<unresolved overloaded function type>' to 'std::vector<bool>::size_type {aka long unsigned int}'
/in/foo.cc:28:4: error: 'visiter' was not declared in this scope
    visiter[next] = true;
    ^~~~~~~
/in/foo.cc:29:17: error: 'step' was not declared in this scope
    q.push({next,step+1});
                 ^~~~
/in/foo.cc:29:24: error: no matching function for call to 'std::queue<std::pair<int, int> >::push(<brace-enclosed initializer list>)'
    q.push({next,step+1});
                        ^
In file included from /usr/include/c++/6/queue:64:0,
                 from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:86,
                 from /in/foo.cc:1:
/usr/include/c++/6/bits/stl_queue.h:242:7: note: candidate: void std::queue<_Tp, _Sequence>::push(const value_type&) [with _Tp = std::pair<int, int>; _Sequence = std::deque<std::pair<int, int>, std::allocator<std::pair<int, int> > >; std::queue<_Tp, _Sequence>::value_type = std::pair<int, int>]
       push(const value_type& __x)
       ^~~~
/usr/include/c++/6/bits/stl_queue.h:242:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const value_type& {aka const std::pair<int, int>&}'
/usr/include/c++/6/bits/stl_queue.h:247:7: note: candidate: void std::queue<_Tp, _Sequence>::push(std::queue<_Tp, _Sequence>::value_type&&) [with _Tp = std::pair<int, int>; _Sequence = std::deque<std::pair<int, int>, std::allocator<std::pair<int, int> > >; std::queue<_Tp, _Sequence>::value_type = std::pair<int, int>]
       push(value_type&& __x)
       ^~~~
/usr/include/c++/6/bits/stl_queue.h:247:7: note:   no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'std::queue<std::pair<int, int> >::value_type&& {aka std::pair<int, int>&&}'