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Jul 24th, 2019
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  1. void dfs(int v) {
  2. used[v] = 1;
  3. ans[v] = 1;
  4. k[v] = 1;
  5. for (auto &to : g[v]) {
  6. if (!used[to]) {
  7. dfs(to);
  8. ans[v] += ans[to] + k[to];
  9. k[v] += k[to];
  10. }
  11. }
  12. }
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