diff --git a/nvim/lazy-lock.json b/nvim/lazy-lock.json
index 64cf010..0a8d285 100644
--- a/nvim/lazy-lock.json
+++ b/nvim/lazy-lock.json
@@ -1,11 +1,11 @@
 {
   "Comment.nvim": { "branch": "master", "commit": "0236521ea582747b58869cb72f70ccfa967d2e89" },
-  "LuaSnip": { "branch": "master", "commit": "2b6860d15aaab01d3fb90859c0ba97f20ad7bc5f" },
+  "LuaSnip": { "branch": "master", "commit": "50fcf17db7c75af80e6b6109acfbfb4504768780" },
   "NeoColumn.nvim": { "branch": "main", "commit": "db7695c7c70fcacd290712deef659bca464634ee" },
   "arshamiser.nvim": { "branch": "dev", "commit": "53a73d60d426cb17860d4de169bce00ec3996c16" },
   "arshlib.nvim": { "branch": "master", "commit": "111fd439268adda206a24b133096893869a50764" },
   "auto-save.nvim": { "branch": "main", "commit": "979b6c82f60cfa80f4cf437d77446d0ded0addf0" },
-  "barbar.nvim": { "branch": "master", "commit": "dd852401ee902745b67fc09a83d113b3fe82a96f" },
+  "barbar.nvim": { "branch": "master", "commit": "79f7d16578a167bdf5355725551ef7d90613a601" },
   "barbecue": { "branch": "main", "commit": "cd7e7da622d68136e13721865b4d919efd6325ed" },
   "better-escape.vim": { "branch": "master", "commit": "6b16a45a839727977277f6ab11bded63e9ed86bb" },
   "cmp-buffer": { "branch": "main", "commit": "3022dbc9166796b644a841a02de8dd1cc1d311fa" },
@@ -22,48 +22,49 @@
   "eslint.nvim": { "branch": "main", "commit": "158f2289907d377018752fcfe0d61b746dc11767" },
   "feline.nvim": { "branch": "master", "commit": "3587f57480b88e8009df7b36dc84e9c7ff8f2c49" },
   "fidget.nvim": { "branch": "main", "commit": "0ba1e16d07627532b6cae915cc992ecac249fb97" },
-  "fzf-lua": { "branch": "main", "commit": "b92220ec838c195eb1c711daa69c905b1d7b8d8c" },
+  "fzf-lua": { "branch": "main", "commit": "2e88254c2045e14c712ee09f1e461c6056a2b18c" },
+  "gatekeeper.nvim": { "branch": "main", "commit": "fa33c5c2dc13f0c25384c3c9e6621c7426d80d25" },
   "git-conflict.nvim": { "branch": "main", "commit": "bfd9fe6fba9a161fc199771d85996236a0d0faad" },
-  "gitsigns.nvim": { "branch": "main", "commit": "75dc649106827183547d3bedd4602442340d2f7f" },
+  "gitsigns.nvim": { "branch": "main", "commit": "4a143f13e122ab91abdc88f89eefbe70a4858a56" },
   "goto-preview": { "branch": "main", "commit": "3552fad4a0244ffd9ac86508e29ccc5166f19eb8" },
   "heirline.nvim": { "branch": "master", "commit": "0d797435e54645a5f98bad7ad6046aac1ef95c1e" },
   "hlargs.nvim": { "branch": "main", "commit": "30fe1b3de2b7614f061be4fc9c71984a2b87e50a" },
   "hop.nvim": { "branch": "master", "commit": "036462a345792279c58f2f6445756efab706f04a" },
-  "image.nvim": { "branch": "master", "commit": "645f997d171ea3d2505986a0519755600a26f02f" },
+  "image.nvim": { "branch": "master", "commit": "a2a0849e0b3dbed90f9283603cedb683bda5d4d1" },
   "indent-blankline.nvim": { "branch": "master", "commit": "d98f537c3492e87b6dc6c2e3f66ac517528f406f" },
-  "lazy.nvim": { "branch": "main", "commit": "0fc34a0cf5f5f6f998a0897119a7d846b47eaa9d" },
-  "lazydev.nvim": { "branch": "main", "commit": "e2bc1915b1056c422256f58025ff9a1e0488018c" },
-  "legendary.nvim": { "branch": "master", "commit": "ed71afddfbe70493cbbc6a51ec3433840913a3e2" },
+  "lazy.nvim": { "branch": "main", "commit": "eb4957442e3182f051b0ae11da32e06d22c190e3" },
+  "lazydev.nvim": { "branch": "main", "commit": "107231114623e2c4f90c626ec83b3120816b554e" },
+  "legendary.nvim": { "branch": "master", "commit": "280d5ffa73927317ff44d781ac1becdec6415540" },
   "listish.nvim": { "branch": "master", "commit": "3bc4bb02036f3802c6428c6232633d3192ac3604" },
   "lsp_signature.nvim": { "branch": "master", "commit": "2ec2ba23882329c1302dff773b0d3620371d634f" },
   "lspkind.nvim": { "branch": "master", "commit": "1735dd5a5054c1fb7feaf8e8658dbab925f4f0cf" },
   "luvit-meta": { "branch": "main", "commit": "ce76f6f6cdc9201523a5875a4471dcfe0186eb60" },
   "marks.nvim": { "branch": "master", "commit": "74e8d01b2a2131b6e46354cffc553aa7f81bcf5b" },
-  "mason-lspconfig.nvim": { "branch": "main", "commit": "a4caa0d083aab56f6cd5acf2d42331b74614a585" },
+  "mason-lspconfig.nvim": { "branch": "main", "commit": "8db12610bcb7ce67013cfdfaba4dd47a23c6e851" },
   "mason.nvim": { "branch": "main", "commit": "0950b15060067f752fde13a779a994f59516ce3d" },
   "melange-nvim": { "branch": "master", "commit": "800490ee87ce3e1b4afe751ff81f2864cb01937d" },
   "modicator.nvim": { "branch": "main", "commit": "780ea1e98c9bee8f3816685213b0aac42b34cd75" },
   "neo-tree.nvim": { "branch": "v3.x", "commit": "29f7c215332ba95e470811c380ddbce2cebe2af4" },
-  "neogit": { "branch": "master", "commit": "3d58bf1d548f6fafdaab8ce4d75e25c438aee92c" },
-  "nui.nvim": { "branch": "main", "commit": "b1b3dcd6ed8f355c78bad3d395ff645be5f8b6ae" },
+  "neogit": { "branch": "master", "commit": "ade9858cb6c434f3642f0b6296ac8d9d4ee51935" },
+  "nui.nvim": { "branch": "main", "commit": "322978c734866996274467de084a95e4f9b5e0b1" },
   "null-ls.nvim": { "branch": "main", "commit": "0010ea927ab7c09ef0ce9bf28c2b573fc302f5a7" },
   "nvim-autopairs": { "branch": "master", "commit": "c15de7e7981f1111642e7e53799e1211d4606cb9" },
-  "nvim-cmp": { "branch": "main", "commit": "5260e5e8ecadaf13e6b82cf867a909f54e15fd07" },
+  "nvim-cmp": { "branch": "main", "commit": "a110e12d0b58eefcf5b771f533fc2cf3050680ac" },
   "nvim-colorizer.lua": { "branch": "master", "commit": "85855b38011114929f4058efc97af1059ab3e41d" },
-  "nvim-lspconfig": { "branch": "master", "commit": "74e14808cdb15e625449027019406e1ff6dda020" },
+  "nvim-lspconfig": { "branch": "master", "commit": "92166b89ab4b3d60f24e58170cac53b7141fd032" },
   "nvim-navic": { "branch": "master", "commit": "8649f694d3e76ee10c19255dece6411c29206a54" },
   "nvim-neoclip.lua": { "branch": "main", "commit": "709c97fabec9da7d04f7d2f5e207423af8c02871" },
   "nvim-notify": { "branch": "master", "commit": "d333b6f167900f6d9d42a59005d82919830626bf" },
   "nvim-numbertoggle": { "branch": "main", "commit": "c5827153f8a955886f1b38eaea6998c067d2992f" },
-  "nvim-origami": { "branch": "main", "commit": "fd3036a2235d188dce43274fed8392795a0cd392" },
-  "nvim-surround": { "branch": "main", "commit": "f1f0699a1d49f28e607ffa4361f1bbe757ac5ebc" },
-  "nvim-treesitter": { "branch": "master", "commit": "5a8e9644c49f992f47bacd7900f4404df6fd9d38" },
+  "nvim-origami": { "branch": "main", "commit": "c824f470e0c177707822c37b13087ab1dd7ddf91" },
+  "nvim-surround": { "branch": "main", "commit": "6a8f0f1e7e6e8facc9ba7c8f217daf84122b7a9b" },
+  "nvim-treesitter": { "branch": "master", "commit": "c1e1e24b6433d4539bad9f5daa207df39633071b" },
   "nvim-treesitter-context": { "branch": "master", "commit": "5efba33af0f39942e426340da7bc15d7dec16474" },
   "nvim-treesitter-endwise": { "branch": "master", "commit": "8b34305ffc28bd75a22f5a0a9928ee726a85c9a6" },
   "nvim-treesitter-refactor": { "branch": "master", "commit": "65ad2eca822dfaec2a3603119ec3cc8826a7859e" },
-  "nvim-treesitter-textobjects": { "branch": "master", "commit": "fd41b7ccc5490a3a99c734d1ee418b68d06c48a9" },
-  "nvim-web-devicons": { "branch": "master", "commit": "b77921fdc44833c994fdb389d658ccbce5490c16" },
-  "outline.nvim": { "branch": "main", "commit": "6a91568110684ac056e62e3b2d7409d7c8b2e5e1" },
+  "nvim-treesitter-textobjects": { "branch": "master", "commit": "34867c69838078df7d6919b130c0541c0b400c47" },
+  "nvim-web-devicons": { "branch": "master", "commit": "b4b302d6ae229f67df7a87ef69fa79473fe788a9" },
+  "outline.nvim": { "branch": "main", "commit": "028e0bc8ad3d511e9fc1f0678594a608eb908ee5" },
   "plenary.nvim": { "branch": "master", "commit": "a3e3bc82a3f95c5ed0d7201546d5d2c19b20d683" },
   "prettier.nvim": { "branch": "main", "commit": "d98e732cb73690b07c00c839c924be1d1d9ac5c2" },
   "search.nvim": { "branch": "main", "commit": "7b8f2315d031be73e14bc2d82386dfac15952614" },
@@ -76,9 +77,9 @@
   "telescope-git-file-history.nvim": { "branch": "master", "commit": "f94fab1d5a51fa28dd95b1a6bd377505dc1a8e82" },
   "telescope-undo.nvim": { "branch": "main", "commit": "95b61c01ea3a4c9e8747731148e905bbcf0ccaee" },
   "telescope.nvim": { "branch": "master", "commit": "d90956833d7c27e73c621a61f20b29fdb7122709" },
-  "tiny-devicons-auto-colors.nvim": { "branch": "main", "commit": "f57c4fa6a22a1c940fa63750c107217f6d88a7dd" },
+  "tiny-devicons-auto-colors.nvim": { "branch": "main", "commit": "13f9391c2bf43df5224924667bdb66cedea37484" },
   "todo-comments.nvim": { "branch": "main", "commit": "70a93ce66083699571adc361166504b03cc39c2b" },
-  "trouble.nvim": { "branch": "main", "commit": "915179759c9459b69faae90a38da6fc1ca6b90d7" },
+  "trouble.nvim": { "branch": "main", "commit": "806c50491078b66daf13c408042f2e74da46d0ff" },
   "twilight.nvim": { "branch": "main", "commit": "8b7b50c0cb2dc781b2f4262a5ddd57571556d1e4" },
   "vim-cursorword": { "branch": "master", "commit": "34852083276c1fd9ff4cccaf052111e7d5a2472e" },
   "vim-fugitive": { "branch": "master", "commit": "4f59455d2388e113bd510e85b310d15b9228ca0d" },
@@ -87,5 +88,5 @@
   "vim-visual-multi": { "branch": "master", "commit": "b84a6d42c1c10678928b0bf8327f378c8bc8af5a" },
   "vim-vsnip": { "branch": "master", "commit": "02a8e79295c9733434aab4e0e2b8c4b7cea9f3a9" },
   "vim-wakatime": { "branch": "master", "commit": "3cb40867cb5a3120f9bef76eff88edc7f1dc1a23" },
-  "which-key.nvim": { "branch": "main", "commit": "4b7167f8fb2dba3d01980735e3509e172c024c29" }
+  "which-key.nvim": { "branch": "main", "commit": "0099511294f16b81c696004fa6a403b0ae61f7a0" }
 }
\ No newline at end of file
diff --git a/nvim/lua/config.lua b/nvim/lua/config.lua
index af597b3..42be794 100644
--- a/nvim/lua/config.lua
+++ b/nvim/lua/config.lua
@@ -411,6 +411,9 @@ local plugins = {
     {
         'lewis6991/spaceless.nvim',  -- Automatically remove trailing space
     },
+    {
+        'augustocdias/gatekeeper.nvim',  -- Set buffer to RO when editing external files
+    },
 }
 require("lazy").setup(plugins, {})
 
@@ -567,6 +570,7 @@ lspconfig.rust_analyzer.setup {
     ['rust-analyzer'] = {},
   },
 }
+lspconfig.hls.setup {}
 lspconfig.lua_ls.setup {
     capabilities = capabilities
 }
@@ -641,11 +645,10 @@ vim.keymap.set('v', "<C-S-j>", "dpV`]")
 vim.keymap.set('v', "<C-S-k>", "dkPV`]")
 vim.keymap.set('n', '<C-p>', '<Cmd>Legendary<CR>', {noremap=true})
 vim.keymap.set({'n', 'v', 'x'}, '<leader>h', '<Cmd>HopWord<CR>')
-vim.keymap.set('n', '<leader>dd', '<Cmd>TroubleToggle document_diagnostics<CR>');
-vim.keymap.set('n', '<leader>dw', '<Cmd>TroubleToggle workspace_diagnostics<CR>');
-vim.keymap.set('n', '<leader>dq', '<Cmd>TroubleToggle quickfix<CR>');
-vim.keymap.set('n', '<leader>w', '<Cmd>TroubleToggle lsp_definitions<CR>');
-vim.keymap.set('n', '<leader>r', '<Cmd>TroubleToggle lsp_references<CR>');
+vim.keymap.set('n', '<leader>dd', '<Cmd>Trouble diagnostics toggle focus=true filter.buf=0<CR>');
+vim.keymap.set('n', '<leader>dw', '<Cmd>Trouble diagnostics toggle focus=true<CR>');
+vim.keymap.set('n', '<leader>dq', '<Cmd>Trouble qflist toggle focus=true<CR>');
+vim.keymap.set('n', '<leader>w', '<Cmd>Trouble lsp toggle focus=true<CR>');
 vim.keymap.set('n', '<A-t>', '<Cmd>BufferPick<CR>', {noremap=true});
 vim.keymap.set('n', '<C-g>', '<Cmd>Neogit kind=split_above<CR>', {noremap=true});
 vim.keymap.set({'v', 'x'}, '<leader>cc', '<Cmd>CodeSnap<CR>', {noremap=true});
@@ -656,10 +659,11 @@ vim.keymap.set('n', '<C-BS>', 'd0i<BS><ESC>l', {noremap=true})
 vim.keymap.set('i', '<C-BS>', '<C-u><BS>', {noremap=true})
 vim.keymap.set('n', '<leader><leader>', '<Cmd>Telescope help_tags<CR>', {noremap=true})
 vim.keymap.set('n', '<leader>p', '<Cmd>Telescope neoclip a extra=plus,unnamedplus<CR>', {noremap=true})
+vim.keymap.set('n', '<leader>k', '<Cmd>SearchInCurrentFile<CR>')
 -- vim.keymap.set('n', )
 
 vim.api.nvim_create_user_command('SearchInCurrentFile', function()
-    vim.ui.input({ prompt = 'Grep > '}, function(input)
+    vim.ui.input({ prompt = 'Grep ...'}, function(input)
         if input ~= nil then
             vim.cmd('vimgrep /' .. input .. '/j %')
             vim.cmd('horizontal copen')
@@ -988,3 +992,12 @@ vim.api.nvim_create_autocmd("LspAttach",  {
 })
 
 require('neoclip').setup {}
+
+require('gatekeeper').setup({
+-- default values
+    exclude = {
+        vim.fn.expand('~/.config/nvim'),
+    },
+    exclude_regex = {},
+    debug = false, -- will call vim.notify with info when it is being evaluated
+})
diff --git a/nvim/lua/snippets/hash-vec.lua b/nvim/lua/snippets/hash-vec.lua
index f9e295a..f761435 100644
--- a/nvim/lua/snippets/hash-vec.lua
+++ b/nvim/lua/snippets/hash-vec.lua
@@ -69,4 +69,25 @@ struct hash_vec {
     }
 };
 
+struct range_hash {
+    vector<pair<MLL<MDL1>, MLL<MDL2>>> hp;
+    template <typename T>
+    range_hash(const T& vec) {
+        hp.emplace_back();
+        hash_vec<ll> hs(vec.size());
+        for (auto&& x : vec) {
+            hs.push_back(x);
+            hp.emplace_back(hs.hash());
+        }
+    }
+
+    /// query hash of subarray [l, r]. Index starts from 0.
+    pair<MLL<MDL1>, MLL<MDL2>> range_query(size_t l, size_t r) {
+        return {
+            (hp[r + 1].first - hp[l].first * power1[r + 1 - l]),
+            (hp[r + 1].second - hp[l].second * power2[r + 1 - l]),
+        };
+    }
+};
+
 ]]