diff --git a/nixos/configuration.nix b/nixos/configuration.nix
index 36b0e74..db40124 100644
--- a/nixos/configuration.nix
+++ b/nixos/configuration.nix
@@ -24,8 +24,17 @@ in {
     ];
 
   # Use the systemd-boot EFI boot loader.
-  boot.loader.systemd-boot.enable = true;
-  boot.loader.efi.canTouchEfiVariables = true;
+  boot.loader = {
+    efi.canTouchEfiVariables = true;
+    grub = {
+      enable =true;
+      devices = [ "nodev" ];
+      efiSupport = true;
+      useOSProber = true;
+    };
+  };
+  # boot.loader.systemd-boot.enable = true;
+  # boot.loader.efi.canTouchEfiVariables = true;
 
   networking.hostName = "zbook"; # Define your hostname.
   # Pick only one of the below networking options.
@@ -33,7 +42,10 @@ in {
   networking.networkmanager.enable = true;  # Easiest to use and most distros use this by default.
 
   # Set your time zone.
-  time.timeZone = "Asia/Shanghai";
+  time = {
+    timeZone = "Asia/Shanghai";
+    hardwareClockInLocalTime = true;
+  };
 
   # Configure network proxy if necessary
   networking.nameservers = [
@@ -93,6 +105,13 @@ in {
   };
   # services.networking.wireless.userControlled = true;
   services.blueman.enable = true;
+  services.earlyoom = {
+    enable = true;
+    freeMemThreshold = 3;
+    freeSwapThreshold = 3;
+  };
+  services.gvfs.enable = true;
+  services.udisks2.enable = true;
 
 
   
@@ -119,7 +138,7 @@ in {
         enable = true;
 	enableOffloadCmd = true;
       };
-      amdgpuBusId = "PCI:101:0:0";
+      amdgpuBusId = "PCI:102:0:0";
       nvidiaBusId = "PCI:1:0:0";
     };
     package = config.boot.kernelPackages.nvidiaPackages.mkDriver {
@@ -168,6 +187,7 @@ in {
       "wireshark"
       "vboxusers"
       "networkmanager"
+      "docker"
     ]; # Enable ‘sudo’ for the user.
     packages = with pkgs; [
       home-manager
@@ -199,6 +219,10 @@ in {
     iptables
   ];
 
+  environment.etc."fuse.conf".text = ''
+    user_allow_other
+  '';
+
   # Some programs need SUID wrappers, can be configured further or are
   # started in user sessions.
   programs.mtr.enable = true;
@@ -230,15 +254,24 @@ in {
     htb  = { config = '' config /home/user/Downloads/starting_point_bzw.ovpn ''; };
   };
 
-  virtualisation.virtualbox = {
-    host = {
-      enable = true;
-      enableExtensionPack = true;
+  virtualisation = {
+    virtualbox = {
+      host = {
+        enable = true;
+        enableExtensionPack = true;
+      };
+      guest = {
+        enable = true;
+        draganddrop = true;
+        clipboard = true;
+      };
     };
-    guest = {
+    docker = {
       enable = true;
-      draganddrop = true;
-      clipboard = true;
+      rootless = {
+        enable = true;
+	setSocketVariable = true;
+      };
     };
   };
 
@@ -278,6 +311,7 @@ in {
   #
   # For more information, see `man configuration.nix` or https://nixos.org/manual/nixos/stable/options#opt-system.stateVersion .
   system.stateVersion = "24.05"; # Did you read the comment?
+  system.autoUpgrade.enable = true;
 
 
 }
diff --git a/nvim/lua/snippets/hash-vec.lua b/nvim/lua/snippets/hash-vec.lua
index f761435..53417ee 100644
--- a/nvim/lua/snippets/hash-vec.lua
+++ b/nvim/lua/snippets/hash-vec.lua
@@ -74,7 +74,7 @@ struct range_hash {
     template <typename T>
     range_hash(const T& vec) {
         hp.emplace_back();
-        hash_vec<ll> hs(vec.size());
+        hash_vec<ll> hs(vec.size() + 1);
         for (auto&& x : vec) {
             hs.push_back(x);
             hp.emplace_back(hs.hash());