Function pars

code/graph/tarjan_olca.test.cpp:27–36

}

int* pars(int n, vi *adj) {
  int *res = new int[n];
  memset(res, -1, n << 2);
  for (int i = 0; i < n; i++) {
    for (int j = 0; j < size(adj[i]); j++) {
      res[adj[i][j]] = i;
    }
  }
  return res;
}

pair<vi*, int> random_tree(int n) {
  vi *adj = new vi[n];