题目搜索，收藏功能

templates/problem_main.html

@@ -50,10 +50,10 @@
                 <div class="section__header">
                     <h1 class="section__title">{{ _('Search') }}</h1>
                 </div>
-                <form method="get" action="{{ url('problem_search') }}">
+                <form method="get" action="{{ url('problem_main') }}">
                     <div class="section__body">
                         <label>
-                            <input name="q" type="text" class="textbox" value="" placeholder="1001">
+                            <input name="q" type="text" class="textbox" value="{{ category }}" placeholder="1001">
                         </label>
                         <button type="submit" class="primary button">{{ _('Search') }}</button>
                     </div>