answer.code:6:1: error: ‘vector’ does not name a type
    6 | vector<int>g[maxn];
      | ^~~~~~
answer.code:15:1: error: ‘multiset’ does not name a type
   15 | multiset<Node>f[maxn][3];
      | ^~~~~~~~
answer.code:16:1: error: ‘multiset’ does not name a type
   16 | multiset<Node>::iterator it,it1,it2;
      | ^~~~~~~~
answer.code: In function ‘void invalid()’:
answer.code:18:9: error: ‘printf’ was not declared in this scope
   18 |         printf("NO");
      |         ^~~~~~
answer.code:1:1: note: ‘printf’ is defined in header ‘<cstdio>’; did you forget to ‘#include <cstdio>’?
  +++ |+#include <cstdio>
    1 | using namespace std;
answer.code:19:9: error: ‘exit’ was not declared in this scope
   19 |         exit(0);
      |         ^~~~
answer.code:1:1: note: ‘exit’ is defined in header ‘<cstdlib>’; did you forget to ‘#include <cstdlib>’?
  +++ |+#include <cstdlib>
    1 | using namespace std;
answer.code: At global scope:
answer.code:24:1: error: ‘vector’ does not name a type
   24 | vector<Ans>ans;
      | ^~~~~~
answer.code: In function ‘void dfs(int, int)’:
answer.code:28:23: error: ‘g’ was not declared in this scope
   28 |         for(int i=0;i<g[x].size();i++){
      |                       ^
answer.code:34:28: error: ‘f’ was not declared in this scope
   34 |                         if(f[v][j].size()>sz[j])
      |                            ^
answer.code:40:31: error: ‘g’ was not declared in this scope
   40 |                 for(int j=0;j<g[x].size();j++){
      |                               ^
answer.code:44:28: error: ‘f’ was not declared in this scope
   44 |                         if(f[v][i].size()==sz[i]){
      |                            ^
answer.code:45:33: error: ‘swap’ was not declared in this scope
   45 |                                 swap(f[v][i],f[x][i]);
      |                                 ^~~~
answer.code:54:31: error: ‘g’ was not declared in this scope
   54 |                 for(int j=0;j<g[x].size();j++){
      |                               ^
answer.code:58:25: error: ‘it’ was not declared in this scope; did you mean ‘i’?
   58 |                         it=f[v][i].begin();
      |                         ^~
      |                         i
answer.code:58:28: error: ‘f’ was not declared in this scope
   58 |                         it=f[v][i].begin();
      |                            ^
answer.code:65:9: error: ‘it’ was not declared in this scope; did you mean ‘int’?
   65 |         it=f[x][0].begin();
      |         ^~
      |         int
answer.code:65:12: error: ‘f’ was not declared in this scope
   65 |         it=f[x][0].begin();
      |            ^
answer.code:67:17: error: ‘it1’ was not declared in this scope
   67 |                 it1=it;
      |                 ^~~
answer.code:74:25: error: ‘it2’ was not declared in this scope
   74 |                         it2=it1;
      |                         ^~~
answer.code:76:25: error: ‘ans’ was not declared in this scope; did you mean ‘Ans’?
   76 |                         ans.push_back((Ans){it->x,it1->x});
      |                         ^~~
      |                         Ans
answer.code:84:17: error: ‘it1’ was not declared in this scope
   84 |                 it1=f[x][2].upper_bound((Node){0,it->dep});
      |                 ^~~
answer.code:88:25: error: ‘ans’ was not declared in this scope; did you mean ‘Ans’?
   88 |                         ans.push_back((Ans){it->x,it1->x});
      |                         ^~~
      |                         Ans
answer.code:89:25: error: ‘it2’ was not declared in this scope
   89 |                         it2=it;
      |                         ^~~
answer.code: In function ‘int main()’:
answer.code:102:9: error: ‘scanf’ was not declared in this scope
  102 |         scanf("%d",&n);
      |         ^~~~~
answer.code:107:17: error: ‘g’ was not declared in this scope
  107 |                 g[x].push_back(y);
      |                 ^
answer.code:119:9: error: ‘printf’ was not declared in this scope
  119 |         printf("YES\n");
      |         ^~~~~~
answer.code:119:9: note: ‘printf’ is defined in header ‘<cstdio>’; did you forget to ‘#include <cstdio>’?
answer.code:120:23: error: ‘ans’ was not declared in this scope; did you mean ‘Ans’?
  120 |         for(int i=0;i<ans.size();i++)
      |                       ^~~
      |                       Ans