diff --git a/remote_judger/src/daemon.ts b/remote_judger/src/daemon.ts
index bfa52c5..af7dbe8 100644
--- a/remote_judger/src/daemon.ts
+++ b/remote_judger/src/daemon.ts
@@ -67,8 +67,8 @@ export default async function daemon(config: UOJConfig) {
 
         if (config.test_sample_only === 'on') {
           await request('/submit', {
-            submit: true,
-            fetch_new: false,
+            submit: 1,
+            fetch_new: 0,
             id,
             result: JSON.stringify({
               status: 'Judged',
@@ -80,6 +80,8 @@ export default async function daemon(config: UOJConfig) {
             judge_time,
           });
 
+          await sleep(TIME.second);
+
           continue;
         }
 
@@ -115,8 +117,8 @@ export default async function daemon(config: UOJConfig) {
           code = fs.readFileSync(sourceCodePath, 'utf-8');
         } catch (e) {
           await request('/submit', {
-            submit: true,
-            fetch_new: false,
+            submit: 1,
+            fetch_new: 0,
             id,
             result: JSON.stringify({
               status: 'Judged',
@@ -135,6 +137,8 @@ export default async function daemon(config: UOJConfig) {
 
           fs.removeSync(tmpdir);
 
+          await sleep(TIME.second);
+
           continue;
         }
 
@@ -152,8 +156,8 @@ export default async function daemon(config: UOJConfig) {
           );
         } catch (err) {
           await request('/submit', {
-            submit: true,
-            fetch_new: false,
+            submit: 1,
+            fetch_new: 0,
             id,
             result: JSON.stringify({
               status: 'Judged',
@@ -172,6 +176,8 @@ export default async function daemon(config: UOJConfig) {
         }
 
         fs.removeSync(tmpdir);
+
+        await sleep(TIME.second);
       }
     } catch (err) {
       logger.error(err.message);
diff --git a/remote_judger/src/vjudge.ts b/remote_judger/src/vjudge.ts
index 50d611f..f34440a 100644
--- a/remote_judger/src/vjudge.ts
+++ b/remote_judger/src/vjudge.ts
@@ -98,8 +98,8 @@ class VJudge {
   ) {
     const next = async payload => {
       return await this.request('/submit', {
-        'update-status': true,
-        fetch_new: false,
+        'update-status': 1,
+        fetch_new: 0,
         id,
         status:
           payload.status ||
@@ -110,8 +110,8 @@ class VJudge {
     const end = async payload => {
       if (payload.error) {
         return await this.request('/submit', {
-          submit: true,
-          fetch_new: false,
+          submit: 1,
+          fetch_new: 0,
           id,
           result: JSON.stringify({
             status: 'Judged',
@@ -128,8 +128,8 @@ class VJudge {
       }
 
       return await this.request('/submit', {
-        submit: true,
-        fetch_new: false,
+        submit: 1,
+        fetch_new: 0,
         id,
         result: JSON.stringify({
           status: 'Judged',
diff --git a/web/app/controllers/subdomain/api/remote_judge/custom_account_validator.php b/web/app/controllers/subdomain/api/remote_judge/custom_account_validator.php
new file mode 100644
index 0000000..f655b20
--- /dev/null
+++ b/web/app/controllers/subdomain/api/remote_judge/custom_account_validator.php
@@ -0,0 +1,86 @@
+<?php
+
+Auth::check() || redirectToLogin();
+
+$type = UOJRequest::get('type', 'is_string', null);
+$curl = new Curl\Curl();
+$curl->setUserAgent(UOJRemoteProblem::USER_AGENT);
+$res = false;
+
+function validateLuogu($response) {
+	$response = json_decode(json_encode($response), true);
+
+	return $response['currentTemplate'] !== 'AuthLogin';
+}
+
+if ($type == 'luogu') {
+	$curl->setFollowLocation();
+	$curl->setCookie('_uid', UOJRequest::post('_uid', 'is_string', ''));
+	$curl->setCookie('__client_id', UOJRequest::post('__client_id', 'is_string', ''));
+
+	retry_loop(function () use (&$curl, &$res) {
+		$curl->get(UOJRemoteProblem::$providers['luogu']['url'] . '/user/setting?_contentOnly=1');
+
+		if ($curl->error) {
+			return false;
+		}
+
+		if ($curl->responseHeaders['Content-Type'] == 'text/html') {
+			$sec = $curl->getResponseCookie('sec');
+
+			if ($sec) {
+				$curl->setCookie('sec', $sec);
+				$curl->get(UOJRemoteProblem::$providers['luogu']['url'] . '/user/setting?_contentOnly=1');
+
+				if ($curl->responseHeaders['Content-Type'] == 'application/json') {
+					$res = validateLuogu($curl->response);
+
+					return true;
+				}
+
+				return false;
+			}
+
+			return false;
+		} else if ($curl->responseHeaders['Content-Type'] == 'application/json') {
+			$res = validateLuogu($curl->response);
+
+			return true;
+		}
+
+		return false;
+	}, 3);
+
+	die(json_encode(['ok' => $res === true]));
+} else if ($type == 'codeforces') {
+	$curl->setFollowLocation();
+	$curl->setCookie('JSESSIONID', UOJRequest::post('JSESSIONID', 'is_string', ''));
+
+	retry_loop(function () use (&$curl, &$res) {
+		$curl->get(UOJRemoteProblem::$providers['codeforces']['url'] . '/enter');
+
+		if ($curl->error) {
+			return false;
+		}
+
+		if (str_starts_with($curl->responseHeaders['Content-Type'], 'text/html')) {
+			if (str_contains($curl->response, 'Login into Codeforces')) {
+				return false;
+			}
+
+			if (strlen($curl->response) < 1000 && str_contains($curl->response, 'Redirecting...')) {
+				return false;
+			}
+
+			$res = true;
+
+			return true;
+		}
+
+		return false;
+	}, 3);
+} else {
+	UOJResponse::page406();
+}
+
+die(json_encode(['ok' => $res === true]));
diff --git a/web/app/controllers/subdomain/api/route.php b/web/app/controllers/subdomain/api/route.php
new file mode 100644
index 0000000..ae169a7
--- /dev/null
+++ b/web/app/controllers/subdomain/api/route.php
@@ -0,0 +1,12 @@
+<?php
+
+call_user_func(function () { // to prevent variable scope leak
+	Route::group(
+		[
+			'domain' => UOJConfig::$data['web']['main']['host'],
+		],
+		function () {
+			Route::post("/api/remote_judge/custom_account_validator", '/subdomain/api/remote_judge/custom_account_validator.php');
+		}
+	);
+});
diff --git a/web/app/models/UOJForm.php b/web/app/models/UOJForm.php
index 963a640..b6d2c51 100644
--- a/web/app/models/UOJForm.php
+++ b/web/app/models/UOJForm.php
@@ -665,7 +665,12 @@ class UOJForm {
 			EOD;
 		} else {
 			echo <<<EOD
-				if (ok) $("#button-submit-{$this->form_name}").addClass('disabled');
+				if (ok) {
+					$("#button-submit-{$this->form_name}").addClass('disabled');
+					$(this).submit(function () {
+						return false;
+					});
+				}
 				return ok;
 			EOD;
 		}
diff --git a/web/index.php b/web/index.php
index 6e29eca..0953945 100644
--- a/web/index.php
+++ b/web/index.php
@@ -5,6 +5,7 @@ require $_SERVER['DOCUMENT_ROOT'] . '/app/libs/uoj-lib.php';
 
 require UOJContext::documentRoot().'/app/route.php';
 require UOJContext::documentRoot().'/app/controllers/subdomain/blog/route.php';
+require UOJContext::documentRoot().'/app/controllers/subdomain/api/route.php';
 
 include UOJContext::documentRoot().'/app/controllers'.call_user_func(function() {
 	$route = Route::dispatch();
diff --git a/web/js/uoj.js b/web/js/uoj.js
index 9146f3d..e08d151 100644
--- a/web/js/uoj.js
+++ b/web/js/uoj.js
@@ -958,19 +958,68 @@ $.fn.remote_submit_type_group = function(oj, pid, url, submit_type) {
 		var input_submit_type_bot = $('<input class="form-check-input" type="radio" name="answer_remote_submit_type" id="' + input_submit_type_bot_id + '" value="bot" />');
 		var input_submit_type_my = $('<input class="form-check-input" type="radio" name="answer_remote_submit_type" id="' + input_submit_type_my_id + '" value="my" />');
 		var input_my_account_data = $('<input type="hidden" name="answer_remote_account_data" value="" />');
+		
+		var my_account_validation_status = $('<span />').append('<span class="text-secondary">待验证</span>');
+		var my_account_validation_btn = $('<button type="button" class="btn btn-secondary btn-sm ms-2">验证</button>');
+
+		var validate_my_account = function(data) {
+			my_account_validation_btn.html('<span class="spinner-border spinner-border-sm" role="status"></span>');
+			my_account_validation_btn.addClass('disabled');
+
+			$.ajax({
+				type: 'POST',
+				url: '/api/remote_judge/custom_account_validator?type=' + oj,
+				data: data,
+				success: function(res) {
+					my_account_validation_btn.html('验证');
+					my_account_validation_btn.removeClass('disabled');
+
+					console.log('Validation status', res);
+
+					if (res.ok) {
+						my_account_validation_status.html('<span class="text-success">可用</span>');
+					} else {
+						my_account_validation_status.html('<span class="text-danger">不可用</span>');
+					}
+				},
+				error: function() {
+					my_account_validation_btn.html('验证');
+					my_account_validation_btn.removeClass('disabled');
+					my_account_validation_status.html('<span class="text-secondary">待验证</span>');
+				},
+				dataType: 'json',
+			});
+		};
 
 		var div_submit_type_bot = $('<div id="' + div_submit_type_bot_id + '" />')
 			.append('<div class="mt-3">将使用公用账号提交本题。</div>');
 		var div_submit_type_my = $('<div id="' + div_submit_type_my_id + '" />')
-			.append('<div class="mt-3">将使用您的账号提交本题。</div>');
+			.append($('<div class="mt-3" />')
+				.append('<span>将使用您的账号提交本题。</span>')
+				.append('<span>账号状态：</span>')
+				.append(my_account_validation_status)
+				.append(my_account_validation_btn)
+				);
+
+		if ('localStorage' in window) {
+			var prefer_submit_type = localStorage.getItem('uoj_remote_judge_save_prefer_submit_type__' + oj) || null;
+			var save_prefer_submit_type = function(type) {
+				localStorage.setItem('uoj_remote_judge_save_prefer_submit_type__' + oj, type);
+			}
+		} else {
+			var prefer_submit_type = null;
+			var save_prefer_submit_type = function(type) {};
+		}
 
 		input_submit_type_bot.click(function() {
 			div_submit_type_my.hide('fast');
 			div_submit_type_bot.show('fast');
+			save_prefer_submit_type('bot');
 		});
 		input_submit_type_my.click(function() {
 			div_submit_type_bot.hide('fast');
 			div_submit_type_my.show('fast');
+			save_prefer_submit_type('my');
 		});
 
 		if (submit_type[0] == 'bot') {
@@ -983,15 +1032,26 @@ $.fn.remote_submit_type_group = function(oj, pid, url, submit_type) {
 
 		if (submit_type.indexOf('bot') == -1) {
 			input_submit_type_bot.attr('disabled', 'disabled');
+		} else if (prefer_submit_type == 'bot') {
+			div_submit_type_my.hide();
+			div_submit_type_bot.show();
+			input_submit_type_bot[0].checked = true;
+			input_submit_type_my[0].checked = false;
 		}
+
 		if (submit_type.indexOf('my') == -1) {
 			input_submit_type_my.attr('disabled', 'disabled');
+		} else if (prefer_submit_type == 'my') {
+			div_submit_type_bot.hide();
+			div_submit_type_my.show();
+			input_submit_type_bot[0].checked = false;
+			input_submit_type_my[0].checked = true;
 		}
 
 		if (oj == 'luogu') {
 			var luogu_account_data = {"_uid": "", "__client_id": ""};
-			var input_luogu_uid = $('<input class="form-control" type="text" name="luogu_uid" id="input-luogu_uid" />');
-			var input_luogu_client_id = $('<input class="form-control" type="text" name="luogu_client_id" id="input-luogu_client_id" />');
+			var input_luogu_uid = $('<input class="form-control font-monospace" type="text" name="luogu_uid" id="input-luogu_uid" />');
+			var input_luogu_client_id = $('<input class="form-control font-monospace" type="text" name="luogu_client_id" id="input-luogu_client_id" />');
 
 			if ('localStorage' in window) {
 				try {
@@ -1012,32 +1072,50 @@ $.fn.remote_submit_type_group = function(oj, pid, url, submit_type) {
 				luogu_account_data._uid = $(this).val();
 				input_my_account_data.val(JSON.stringify(luogu_account_data));
 				save_luogu_account_data();
+				my_account_validation_status.html('<span class="text-secondary">待验证</span>');
 			});
 
 			input_luogu_client_id.change(function() {
 				luogu_account_data.__client_id = $(this).val();
 				input_my_account_data.val(JSON.stringify(luogu_account_data));
 				save_luogu_account_data();
+				my_account_validation_status.html('<span class="text-secondary">待验证</span>');
+			});
+
+			my_account_validation_btn.click(function() {
+				validate_my_account({
+					type: 'luogu',
+					_uid: input_luogu_uid.val(),
+					__client_id: input_luogu_client_id.val(),
+				});
 			});
 
 			input_my_account_data.val(JSON.stringify(luogu_account_data));
 			input_luogu_uid.val(luogu_account_data._uid);
 			input_luogu_client_id.val(luogu_account_data.__client_id);
 
+			if (luogu_account_data._uid && luogu_account_data.__client_id){
+				validate_my_account({
+					type: 'luogu',
+					_uid: luogu_account_data._uid,
+					__client_id: luogu_account_data.__client_id,
+				});
+			}
+
 			div_submit_type_my.append(
-				$('<div class="row mt-3" />')
+				$('<div class="row mt-3 align-items-center" />')
 					.append($('<div class="col-sm-2" />').append('<label for="input-luogu_uid" class="col-form-label">_uid</label>'))
 					.append($('<div class="col-sm-4" />').append(input_luogu_uid))
-					.append($('<div class="col-sm-6" />').append($('<div class="form-text" />').append('请填入 Cookie 中的 <code>_uid</code>。')))
+					.append($('<div class="col-sm-6" />').append($('<div class="form-text mt-0" />').append('请填入 Cookie 中的 <code>_uid</code>。')))
 			).append(
-				$('<div class="row mt-3" />')
+				$('<div class="row mt-3 align-items-center" />')
 					.append($('<div class="col-sm-2" />').append('<label for="input-luogu_client_id" class="col-form-label">__client_id</label>'))
 					.append($('<div class="col-sm-4" />').append(input_luogu_client_id))
-					.append($('<div class="col-sm-6" />').append($('<div class="form-text" />').append('请填入 Cookie 中的 <code>__client_id</code>。')))
+					.append($('<div class="col-sm-6" />').append($('<div class="form-text mt-0" />').append('请填入 Cookie 中的 <code>__client_id</code>。')))
 			).append(input_my_account_data);
 		} else if (oj == 'codeforces') {
 			var codeforces_account_data = {"JSESSIONID": ""};
-			var input_codeforces_jsessionid = $('<input class="form-control" type="text" name="codeforces_jsessionid" id="input-codeforces_jsessionid" />');
+			var input_codeforces_jsessionid = $('<input class="form-control font-monospace" type="text" name="codeforces_jsessionid" id="input-codeforces_jsessionid" />');
 
 			if ('localStorage' in window) {
 				try {
@@ -1056,16 +1134,31 @@ $.fn.remote_submit_type_group = function(oj, pid, url, submit_type) {
 				codeforces_account_data.JSESSIONID = $(this).val();
 				input_my_account_data.val(JSON.stringify(codeforces_account_data));
 				save_codeforces_account_data();
+				my_account_validation_status.html('<span class="text-secondary">待验证</span>');
+			});
+
+			my_account_validation_btn.click(function() {
+				validate_my_account({
+					type: 'codeforces',
+					JSESSIONID: input_codeforces_jsessionid.val(),
+				});
 			});
 
 			input_my_account_data.val(JSON.stringify(codeforces_account_data));
 			input_codeforces_jsessionid.val(codeforces_account_data.JSESSIONID);
 
+			if (codeforces_account_data.JSESSIONID) {
+				validate_my_account({
+					type: 'codeforces',
+					JSESSIONID: codeforces_account_data.JSESSIONID,
+				});
+			}
+
 			div_submit_type_my.append(
-				$('<div class="row mt-3" />')
+				$('<div class="row mt-3 align-items-center" />')
 					.append($('<div class="col-sm-2" />').append('<label for="input-codeforces_jsessionid" class="col-form-label">JSESSIONID</label>'))
 					.append($('<div class="col-sm-4" />').append(input_codeforces_jsessionid))
-					.append($('<div class="col-sm-6" />').append($('<div class="form-text" />').append('请填入 Cookie 中的 <code>JSESSIONID</code>。')))
+					.append($('<div class="col-sm-6" />').append($('<div class="form-text mt-0" />').append('请填入 Cookie 中的 <code>JSESSIONID</code>。')))
 			).append(input_my_account_data);
 		} else if (oj == 'uoj') {
 			var uoj_account_data = {"UOJSESSID": ""};