answer.code: In function ‘void dfs(int)’:
answer.code:26:5: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   26 |     ans[u] = 0;
      |     ^~~
      |     abs
answer.code:40:5: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   40 |     ans[u] = ans[v];
      |     ^~~
      |     abs
answer.code:43:10: error: ‘pii’ was not declared in this scope
   43 |   vector<pii> vt;
      |          ^~~
answer.code:43:13: error: template argument 1 is invalid
   43 |   vector<pii> vt;
      |             ^
answer.code:43:13: error: template argument 2 is invalid
answer.code:49:19: error: ‘struct S’ has no member named ‘L’
   49 |   s[u].len = s[u].L+1;
      |                   ^
answer.code:60:26: error: ‘b’ was not declared in this scope; did you mean ‘db’?
   60 |     auto db = B(s[v].dp, b, L);
      |                          ^
      |                          db
answer.code:60:15: error: ‘B’ was not declared in this scope
   60 |     auto db = B(s[v].dp, b, L);
      |               ^
answer.code:61:26: error: ‘r’ was not declared in this scope; did you mean ‘dr’?
   61 |     auto dr = R(s[v].dp, r, L);
      |                          ^
      |                          dr
answer.code:61:15: error: ‘R’ was not declared in this scope
   61 |     auto dr = R(s[v].dp, r, L);
      |               ^
answer.code:64:3: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   64 |   ans[u] = inf;
      |   ^~~
      |   abs
answer.code: In function ‘void once()’:
answer.code:75:11: warning: format ‘%s’ expects argument of type ‘char*’, but argument 2 has type ‘S*’ [-Wformat=]
   75 |   scanf("%s", s+1);
      |          ~^   ~~~
      |           |    |
      |           |    S*
      |           char*
answer.code:80:46: error: ‘ans’ was not declared in this scope; did you mean ‘abs’?
   80 |   for (int i = 1; i <= n; ++i) printf("%d ", ans[i]);
      |                                              ^~~
      |                                              abs
answer.code:70:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   70 |   scanf("%d", &n);
      |   ~~~~~^~~~~~~~~~
answer.code:75:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   75 |   scanf("%s", s+1);
      |   ~~~~~^~~~~~~~~~~
answer.code:77:10: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   77 |     scanf("%d", &p);
      |     ~~~~~^~~~~~~~~~
answer.code: In function ‘int main()’:
answer.code:86:8: warning: ignoring return value of ‘int scanf(const char*, ...)’ declared with attribute ‘warn_unused_result’ [-Wunused-result]
   86 |   scanf("%d", &t);
      |   ~~~~~^~~~~~~~~~