answer.code:14:3: error: ISO C++ forbids declaration of ‘scc’ with no type [-fpermissive]
   14 |   scc(int n) {
      |   ^~~
answer.code: In member function ‘int atcoder::<unnamed struct>::scc(int)’:
answer.code:17:3: warning: no return statement in function returning non-void [-Wreturn-type]
   17 |   }
      |   ^
answer.code: In member function ‘auto atcoder::<unnamed struct>::build()’:
answer.code:22:35: error: expected ‘,’ or ‘;’ before ‘.’ token
   22 |     vi rep(_n), color(_n), dfn(_n). low(_n);
      |                                   ^
answer.code: In lambda function:
answer.code:27:7: error: ‘low’ was not declared in this scope; did you mean ‘pow’?
   27 |       low[u] = dfn[u] = ++nn;
      |       ^~~
      |       pow
answer.code: At global scope:
answer.code:14:3: error: ‘int atcoder::<unnamed struct>::scc(int)’ invalid; an anonymous struct may only have public non-static data members [-fpermissive]
   14 |   scc(int n) {
      |   ^~~
answer.code:18:8: error: ‘void atcoder::<unnamed struct>::adj(int, int)’ invalid; an anonymous struct may only have public non-static data members [-fpermissive]
   18 |   void adj(int u, int v) {
      |        ^~~
answer.code:21:8: error: ‘auto atcoder::<unnamed struct>::build()’ invalid; an anonymous struct may only have public non-static data members [-fpermissive]
   21 |   auto build() {
      |        ^~~~~
answer.code:12:14: error: member ‘std::vector<std::vector<int> > atcoder::<unnamed struct>::g’ with constructor not allowed in anonymous aggregate
   12 |   vector<vi> g;
      |              ^
answer.code:12:14: error: member ‘std::vector<std::vector<int> > atcoder::<unnamed struct>::g’ with destructor not allowed in anonymous aggregate
answer.code:12:14: error: member ‘std::vector<std::vector<int> > atcoder::<unnamed struct>::g’ with copy assignment operator not allowed in anonymous aggregate
answer.code:52:2: error: abstract declarator ‘atcoder::<unnamed struct>’ used as declaration
   52 | };
      |  ^
answer.code:115:2: error: expected ‘}’ at end of input
  115 | }
      |  ^
answer.code:10:19: note: to match this ‘{’
   10 | namespace atcoder {
      |                   ^
answer.code: In function ‘void atcoder::once()’:
answer.code:55:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   55 |   scanf("%d %d", &n, &m);
      |   ~~~~~^~~~~~~~~~~~~~~~~
answer.code:61:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   61 |     scanf("%d %d", &l, &r);
      |     ~~~~~^~~~~~~~~~~~~~~~~
answer.code: In function ‘int atcoder::main()’:
answer.code:112:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
  112 |   scanf("%d",&tes);
      |   ~~~~~^~~~~~~~~~~