diff --git a/static/src/js/app/oj/problem/problem.js b/static/src/js/app/oj/problem/problem.js
index e34daea..d855d11 100644
--- a/static/src/js/app/oj/problem/problem.js
+++ b/static/src/js/app/oj/problem/problem.js
@@ -1,11 +1,5 @@
 require(["jquery", "codeMirror", "csrfToken", "bsAlert", "ZeroClipboard"],
     function ($, codeMirror, csrfTokenHeader, bsAlert, ZeroClipboard) {
-        var codeEditorSelector = $("#code-editor")[0];
-        // 部分界面逻辑会隐藏代码输入框，先判断有没有。
-        if (codeEditorSelector == undefined) {
-            return;
-        }
-
         // 复制样例需要 Flash 的支持 检测浏览器是否安装了 Flash
         function detect_flash() {
             var ie_flash;
@@ -27,6 +21,12 @@ require(["jquery", "codeMirror", "csrfToken", "bsAlert", "ZeroClipboard"],
             $(".copy-sample").hide();
         }
 
+        var codeEditorSelector = $("#code-editor")[0];
+        // 部分界面逻辑会隐藏代码输入框，先判断有没有。
+        if (codeEditorSelector == undefined) {
+            return;
+        }
+
         var codeEditor = codeMirror(codeEditorSelector, "text/x-csrc");
         var language = $("input[name='language'][checked]").val();
         var submissionId;
diff --git a/template/src/oj/contest/contest_problem.html b/template/src/oj/contest/contest_problem.html
index 6f691b6..896f253 100644
--- a/template/src/oj/contest/contest_problem.html
+++ b/template/src/oj/contest/contest_problem.html
@@ -37,6 +37,7 @@
             {% for item in samples %}
                 <div class="problem-section">
                     <label class="problem-label">样例输入{{ forloop.counter }}</label>
+                    <a href="javascript:void(0)" class="copy-sample" data-clipboard-text="{{ item.input }}">复制</a>
         <pre>
 {{ item.input }}</pre>