answer.code: In function ‘void solve()’:
answer.code:41:9: error: ‘vector’ was not declared in this scope
   41 |         vector<bool> st(n+1);
      |         ^~~~~~
answer.code:5:1: note: ‘std::vector’ is defined in header ‘<vector>’; did you forget to ‘#include <vector>’?
    4 | #include <functional>
  +++ |+#include <vector>
    5 | using namespace std;
answer.code:41:16: error: expected primary-expression before ‘bool’
   41 |         vector<bool> st(n+1);
      |                ^~~~
answer.code:43:23: error: expected primary-expression before ‘int’
   43 |         vector<vector<int>> e(n+1);
      |                       ^~~
answer.code:44:16: error: expected primary-expression before ‘int’
   44 |         vector<int> pre(n+1,0);
      |                ^~~
answer.code:45:16: error: expected primary-expression before ‘int’
   45 |         vector<int> d(n+1,0);
      |                ^~~
answer.code:49:26: error: ‘e’ was not declared in this scope
   49 |                 if(x!=0) e[x].push_back(i),e[i].push_back(x);
      |                          ^
answer.code:50:26: error: ‘e’ was not declared in this scope
   50 |                 if(y!=0) e[y].push_back(i),e[i].push_back(y);
      |                          ^
answer.code: In lambda function:
answer.code:54:17: error: ‘pre’ was not declared in this scope
   54 |                 pre[u] = fa;
      |                 ^~~
answer.code:55:29: error: ‘e’ was not declared in this scope
   55 |                 for(int v : e[u]){
      |                             ^
answer.code:56:37: error: ‘st’ was not declared in this scope; did you mean ‘std’?
   56 |                         if(v==fa || st[v] == 1) continue;
      |                                     ^~
      |                                     std
answer.code:57:25: error: ‘d’ was not declared in this scope
   57 |                         d[v] = d[u] + 1;
      |                         ^
answer.code: In function ‘void solve()’:
answer.code:67:17: error: ‘d’ was not declared in this scope
   67 |                 d[c] = 0;
      |                 ^
answer.code:68:17: error: ‘pre’ was not declared in this scope
   68 |                 pre[c] = 0;
      |                 ^~~
answer.code:99:33: error: ‘st’ was not declared in this scope; did you mean ‘ss’?
   99 |                                 st[mid] = 1;
      |                                 ^~
      |                                 ss
answer.code:102:33: error: ‘st’ was not declared in this scope; did you mean ‘ss’?
  102 |                                 st[mid] = 1;
      |                                 ^~
      |                                 ss
answer.code:118:33: error: ‘st’ was not declared in this scope; did you mean ‘ss’?
  118 |                                 st[mid] = 1;
      |                                 ^~
      |                                 ss
answer.code:121:33: error: ‘st’ was not declared in this scope; did you mean ‘ss’?
  121 |                                 st[pre[mid]] = 1;
      |                                 ^~
      |                                 ss
answer.code:131:25: error: ‘st’ was not declared in this scope; did you mean ‘ss’?
  131 |                         st[pre[mid]] = 1;
      |                         ^~
      |                         ss
answer.code: In function ‘int check(int, int)’:
answer.code:34:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   34 |         scanf("%d",&s);
      |         ~~~~~^~~~~~~~~
answer.code: In function ‘int main()’:
answer.code:142:14: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  142 |         scanf("%d",&t);
      |         ~~~~~^~~~~~~~~