Update shallowest_decomp_tree.hpp

Author: lrvideckis

library/trees/shallowest_decomp_tree.hpp

@@ -24,9 +24,5 @@ void shallowest(auto& adj, auto f) {
   auto cpy(adj);
   adj.assign(sz(adj), {});
   for (vi vec : order)
-    for (int v : vec) {
-      f(v);
-      adj[v] = cpy[v];
-      for (int u : adj[v]) adj[u].push_back(v);
-    }
+    for (int v : vec) f(v), adj[v] = cpy[v];
 }