From a1624e54680578d272c37ede5c717f27413f0e2e Mon Sep 17 00:00:00 2001
From: klarkxy <278370456@qq.com>
Date: Thu, 1 May 2025 16:58:17 +0800
Subject: [PATCH] =?UTF-8?q?=E5=A2=9E=E5=8A=A0=E5=8F=AA=E6=98=BE=E7=A4=BA?=
 =?UTF-8?q?=E6=9C=89=E6=95=88TAG=E7=9A=84=E5=8A=9F=E8=83=BD?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 web/template/syzoj/category.php | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/web/template/syzoj/category.php b/web/template/syzoj/category.php
index 46a011e..b9cb580 100644
--- a/web/template/syzoj/category.php
+++ b/web/template/syzoj/category.php
@@ -26,6 +26,16 @@
             <div class="tag-cloud">
             <?php foreach ($tags as $tag): 
             $label_theme = "default";
+            // Check if this tag has any problems associated with it
+            $sql = "SELECT count(*) as cnt FROM `problem` WHERE defunct='N' AND (title LIKE ? OR source LIKE ?)";
+            $tag_search = "%" . $tag . "%";
+            $result = pdo_query($sql, $tag_search, $tag_search);
+            if (!$result || $result[0]['cnt'] <= 0) continue; // Skip tags with no active problems
+            
+            // Choose a random color theme for the tag
+            $hash_num = hexdec(substr(md5($tag), 0, 7));
+            $label_theme = $color_theme[$hash_num % count($color_theme)];
+            if ($label_theme == "") $label_theme = "default";
             ?>
             <a href="problemset.php?search=<?php echo urlencode($tag); ?>" class="ui <?php echo $label_theme; ?> label"><?php echo $tag; ?></a>
             <?php endforeach; ?>