answer.code: In lambda function:
answer.code:332:24: error: expected identifier before ‘this’
  332 |         auto dfs = [&](this auto && dfs, int u) ->void {
      |                        ^~~~
answer.code:332:24: error: expected ‘,’ or ‘...’ before ‘this’
answer.code: In lambda function:
answer.code:333:17: error: ‘u’ was not declared in this scope
  333 |             siz[u] += 1;
      |                 ^
answer.code:339:17: error: use of ‘dfs’ before deduction of ‘auto’
  339 |                 dfs(v);
      |                 ^~~