add these back too

Author: lrvideckis

library/graphs/uncommon/bridges.hpp

@@ -18,7 +18,7 @@
 auto bridges(const auto& g, int m) {
   int n = sz(g), num_ccs = 0, q = 0, s = 0;
   vi br_id(n, -1), is_br(m), tin(n), st(n);
-  auto dfs = [&](auto dfs, int u, int p) {
+  auto dfs = [&](auto dfs, int u, int p) -> int {
     int low = tin[u] = ++q;
     st[s++] = u;
     for (auto [v, e] : g[u])

library/trees/uncommon/linear_kth_par.hpp

@@ -21,7 +21,7 @@ template<int KAPPA = 2> struct linear_kth_par {
       jmp[t] = st[max(0, s - KAPPA * (t & -t))];
       t++;
     };
-    auto dfs = [&](auto dfs, int u, int p) {
+    auto dfs = [&](auto dfs, int u, int p) -> void {
       int& l = leaf[u] = st[d[u]] = u;
       pos[u] = t;
       calc(d[u]);