Method query

code/graph/hld.cpp:47–48

      u = parent[head[u]];
    return f(res, values.query(loc[v] + 1, loc[u]).x); }
  int query(int u, int v) { int l = lca(u, v);
    return f(query_upto(u, l), query_upto(v, l)); } };
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