diff --git a/models/problem.js b/models/problem.js
index 79be434..1f15fa0 100644
--- a/models/problem.js
+++ b/models/problem.js
@@ -223,8 +223,8 @@ class Problem extends Model {
       is_public: false,
 
       file_io: false,
-      file_io_input_name: 'data.in',
-      file_io_output_name: 'data.out'
+      file_io_input_name: '',
+      file_io_output_name: ''
     }, val)));
   }
 
diff --git a/modules/problem.js b/modules/problem.js
index ddc4028..6766fb6 100644
--- a/modules/problem.js
+++ b/modules/problem.js
@@ -84,6 +84,7 @@ app.get('/problem/:id/edit', async (req, res) => {
     let problem = await Problem.fromID(id);
 
     if (!problem) {
+      if (!res.locals.user) throw 'Permission denied.';
       problem = await Problem.create();
       problem.id = id;
       problem.allowedEdit = true;
diff --git a/views/problem_data.ejs b/views/problem_data.ejs
index 2e086a7..81c1a31 100644
--- a/views/problem_data.ejs
+++ b/views/problem_data.ejs
@@ -116,7 +116,7 @@ let subtaskType = {
           </div>
           <% } %>
           <div class="field">
-              <label for="testdata">更新测试数据</label>
+              <label for="testdata"><% if (!problem.testdata_id) { %>上传测试数据<% } else { %>更新测试数据<% } %></label>
               <input type="file" id="testdata" name="testdata">
           </div>
               <button type="submit" class="ui button">提交</button>
@@ -134,5 +134,18 @@ function goDisable() {
   document.getElementById('file-io-input-name').disabled = true;
   document.getElementById('file-io-output-name').disabled = true;
 }
+
+$(document).ready(function () {
+  $('#file-io-input-name').on('input keyup change', function (e) {
+    var prob = $('#file-io-input-name').val();
+    if (prob.lastIndexOf('.') !== -1) prob = prob.substring(0, prob.lastIndexOf('.'));
+    $('#file-io-output-name').attr('placeholder', prob + '.out');
+  });
+  $('#file-io-output-name').focus(function (e) {
+    if (!$('#file-io-output-name').val()) {
+      $('#file-io-output-name').val($('#file-io-output-name').attr('placeholder'));
+    }
+  });
+});
 </script>
 <% include footer %>
diff --git a/views/problems.ejs b/views/problems.ejs
index c253b53..bbbf7e2 100644
--- a/views/problems.ejs
+++ b/views/problems.ejs
@@ -1,13 +1,15 @@
 <% this.title = '题库' %>
 <% include header %>
 <div class="padding">
-  <div class="ui grid">
-    <div class="row">
-      <div class="column">
-        <a href="<%= syzoj.utils.makeUrl(['problem', 0, 'edit']) %>" class="ui mini right floated button">添加题目</a>
+  <% if (user) { %>
+    <div class="ui grid">
+      <div class="row">
+        <div class="column">
+          <a href="<%= syzoj.utils.makeUrl(['problem', 0, 'edit']) %>" class="ui mini right floated button">添加题目</a>
+        </div>
       </div>
     </div>
-  </div>
+  <% } %>
   <table class="ui very basic center aligned table">
     <thead>
       <tr>
diff --git a/views/submission_content.ejs b/views/submission_content.ejs
index e913645..9477ce4 100644
--- a/views/submission_content.ejs
+++ b/views/submission_content.ejs
@@ -106,7 +106,7 @@ for (let s of judge.result.subtasks) {
     <% } %>
     <% for (let i = 0; i < subtask_cases.case_num; i++) { %>
     <% let testcase = subtask_cases[i]; %>
-    <div class="title<% if (testcase.pending) { %> testcase.pending<% } %> auto_update"<% if (testcase.pending) { %> style="cursor: auto; "<% } %>>
+    <div class="title<% if (testcase.pending) { %> pending<% } %> auto_update"<% if (testcase.pending) { %> style="cursor: auto; "<% } %>>
       <div class="ui grid">
         <div class="three wide column"><i class="dropdown icon"></i>测试点 #<%= i + 1 %></div>
         <div class="four wide column status status_detail <%= getStatusMeta(testcase.status).toLowerCase().split(' ').join('_') %>">