missed spot

Updated lambda function parameters to use rvalue references for better performance.

Author: lrvideckis

library/trees/hld.hpp

@@ -16,7 +16,7 @@ template<bool VALS_EDGES> struct HLD {
   vi p, siz, rt, tin;
   HLD(auto& g): n(sz(g)), p(n), siz(n, 1), rt(n), tin(n) {
     // pass-self, not deducing this: gcc bug 118291
-    auto dfs1 = [&](auto dfs1, int u) -> void {
+    auto dfs1 = [&](auto&& dfs1, int u) -> void {
       for (int& v : g[u]) {
         erase(g[v], p[v] = u);
         dfs1(dfs1, v);
@@ -26,7 +26,7 @@ template<bool VALS_EDGES> struct HLD {
     };
     dfs1(dfs1, 0);
     int tim = 0;
-    auto dfs2 = [&](auto dfs2, int u) -> void {
+    auto dfs2 = [&](auto&& dfs2, int u) -> void {
       tin[u] = tim++;
       for (int v : g[u]) {
         rt[v] = (v == g[u][0] ? rt[u] : v);