Phase 3 / tree, lca, frequency
Phase 5 / tree/distance/propagation
Phase 5 / trees/pruning/path_max
Phase 6 / tree/dp
Phase 6 / tree/path-query
Phase 6 / tree/xor
Phase 6 / dp/tree
Phase 6 / tree, lca, path, color counting
Phase 6 / tree, dfs, component, diameter
Phase 6 / tree, path query, exclusion subtree
Phase 3 / tree-query
Phase 3 / tree-dp