diff --git a/web/app/controllers/problem.php b/web/app/controllers/problem.php
index a4ca1b1..cf2b178 100644
--- a/web/app/controllers/problem.php
+++ b/web/app/controllers/problem.php
@@ -219,10 +219,12 @@ EOD
 		$custom_test_form->runAtServer();
 	}
 	?>
+
 <?php
 	$REQUIRE_LIB['mathjax'] = '';
 	$REQUIRE_LIB['shjs'] = '';
 	?>
+
 <?php echoUOJPageHeader(HTML::stripTags($problem['title']) . ' - ' . UOJLocale::get('problems::problem')) ?>
 <?php
 	$limit = getUOJConf("/var/uoj_data/{$problem['id']}/problem.conf");
@@ -234,9 +236,52 @@ EOD
 
 <?php if (isset($REQUIRE_LIB['bootstrap5'])): ?>
 <div class="row">
+
+<!-- Left col -->
 <div class="col-lg-9">
 <?php endif ?>
 
+<?php if (isset($REQUIRE_LIB['bootstrap5']) && $contest): ?>
+<!-- 比赛导航 -->
+<?php
+	$tabs_info = array(
+		'dashboard' => array(
+			'name' => UOJLocale::get('contests::contest dashboard'),
+			'url' => "/contest/{$contest['id']}"
+		),
+		'submissions' => array(
+			'name' => UOJLocale::get('contests::contest submissions'),
+			'url' => "/contest/{$contest['id']}/submissions"
+		),
+		'standings' => array(
+			'name' => UOJLocale::get('contests::contest standings'),
+			'url' => "/contest/{$contest['id']}/standings"
+		),
+	);
+
+	if ($contest['cur_progress'] > CONTEST_TESTING) {
+		$tabs_info['after_contest_standings'] = array(
+			'name' => UOJLocale::get('contests::after contest standings'),
+			'url' => "/contest/{$contest['id']}/after_contest_standings"
+		);
+		$tabs_info['self_reviews'] = array(
+			'name' => UOJLocale::get('contests::contest self reviews'),
+			'url' => "/contest/{$contest['id']}/self_reviews"
+		);
+	}
+
+	if (hasContestPermission(Auth::user(), $contest)) {
+		$tabs_info['backstage'] = array(
+			'name' => UOJLocale::get('contests::contest backstage'),
+			'url' => "/contest/{$contest['id']}/backstage"
+		);
+	}
+	?>
+	<div class="mb-2">
+		<?= HTML::tablist($tabs_info, '', 'nav-pills') ?>
+	</div>
+<?php endif ?>
+
 <?php if (!isset($REQUIRE_LIB['bootstrap5'])): ?>
 <div class="row d-flex justify-content-center">
 	<span class="badge badge-secondary mr-1">时间限制:<?=$time_limit!=null?"$time_limit s":"N/A"?></span>
@@ -359,10 +404,13 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 
 <?php if (isset($REQUIRE_LIB['bootstrap5'])): ?>
 </div>
+<!-- End left col -->
 
 <aside class="col mt-3 mt-lg-0">
+<!-- Right col -->
 
 <?php if ($contest): ?>
+<!-- Contest card -->
 <div class="card card-default mb-2">
 	<div class="card-body">
 		<h3 class="h5 card-title text-center">
@@ -378,14 +426,6 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 			<?php endif ?>
 		</div>
 	</div>
-	<ul class="nav nav-pills nav-fill flex-column" role="tablist">
-		<li class="nav-item text-start">
-			<a class="nav-link" href="/contest/<?= $contest['id'] ?>" role="tab">
-				<i class="bi bi-arrow-90deg-left"></i>
-				<?= UOJLocale::get('contests::back to the contest') ?>
-			</a>
-		</li>
-	</ul>
 	<div class="card-footer bg-transparent">
 		比赛评价：<?= getClickZanBlock('C', $contest['id'], $contest['zan']) ?>
 	</div>
@@ -397,6 +437,7 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 <?php endif ?>
 <?php endif ?>
 
+<!-- 题目导航卡片 -->
 <div class="card card-default mb-2">
 	<ul class="nav nav-pills nav-fill flex-column" role="tablist">
 		<li class="nav-item text-start">
@@ -453,6 +494,7 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 	</div>
 </div>
 
+<!-- 附件 -->
 <div class="card card-default mb-2">
 	<ul class="nav nav-fill flex-column">
 		<li class="nav-item text-start">
@@ -481,7 +523,7 @@ $('#contest-countdown').countdown(<?= $contest['end_time']->getTimestamp() - UOJ
 
 </div>
 
-
+<!-- 表格处理 -->
 <script>
 	$(document).ready(function() {
 		$('.markdown-body table').each(function() {
diff --git a/web/app/controllers/problem_statistics.php b/web/app/controllers/problem_statistics.php
index 16d50ef..2a9544b 100644
--- a/web/app/controllers/problem_statistics.php
+++ b/web/app/controllers/problem_statistics.php
@@ -17,6 +17,13 @@
 		if (!isContestProblemVisibleToUser($problem, $contest, $myUser)) {
 			become404Page();
 		}
+
+		$problem_rank = queryContestProblemRank($contest, $problem);
+		if ($problem_rank == null) {
+			become404Page();
+		} else {
+			$problem_letter = chr(ord('A') + $problem_rank - 1);
+		}
 	} else {
 		if (!isProblemVisibleToUser($problem, $myUser)) {
 			become404Page();
@@ -76,6 +83,47 @@
 <div class="col-lg-9">
 <?php endif ?>
 
+<?php if (isset($REQUIRE_LIB['bootstrap5']) && $contest): ?>
+<!-- 比赛导航 -->
+<?php
+	$tabs_info = array(
+		'dashboard' => array(
+			'name' => UOJLocale::get('contests::contest dashboard'),
+			'url' => "/contest/{$contest['id']}"
+		),
+		'submissions' => array(
+			'name' => UOJLocale::get('contests::contest submissions'),
+			'url' => "/contest/{$contest['id']}/submissions"
+		),
+		'standings' => array(
+			'name' => UOJLocale::get('contests::contest standings'),
+			'url' => "/contest/{$contest['id']}/standings"
+		),
+	);
+
+	if ($contest['cur_progress'] > CONTEST_TESTING) {
+		$tabs_info['after_contest_standings'] = array(
+			'name' => UOJLocale::get('contests::after contest standings'),
+			'url' => "/contest/{$contest['id']}/after_contest_standings"
+		);
+		$tabs_info['self_reviews'] = array(
+			'name' => UOJLocale::get('contests::contest self reviews'),
+			'url' => "/contest/{$contest['id']}/self_reviews"
+		);
+	}
+
+	if (hasContestPermission(Auth::user(), $contest)) {
+		$tabs_info['backstage'] = array(
+			'name' => UOJLocale::get('contests::contest backstage'),
+			'url' => "/contest/{$contest['id']}/backstage"
+		);
+	}
+	?>
+	<div class="mb-2">
+		<?= HTML::tablist($tabs_info, '', 'nav-pills') ?>
+	</div>
+<?php endif ?>
+
 <?php if (isset($REQUIRE_LIB['bootstrap5'])): ?>
 <div class="card card-default mb-2">
 <div class="card-body">
@@ -137,11 +185,11 @@
 
 <?php
 $table_config = [];
-if (isset($REQUIRE_LIB['bootstrap5'])) {
-	$table_config['div_classes'] = ['mb-3'];
-	$table_config['table_classes'] = ['table', 'mb-0', 'text-center'];
-}
-?>
+	if (isset($REQUIRE_LIB['bootstrap5'])) {
+		$table_config['div_classes'] = ['mb-3'];
+		$table_config['table_classes'] = ['table', 'mb-0', 'text-center'];
+	}
+	?>
 
 <?php if ($submissions_sort_by_choice == 'time'): ?>
 	<?php echoSubmissionsList("best_ac_submissions.submission_id = submissions.id and best_ac_submissions.problem_id = {$problem['id']}", 'order by best_ac_submissions.used_time, best_ac_submissions.used_memory, best_ac_submissions.tot_size', array('problem_hidden' => '', 'judge_time_hidden' => '', 'table_name' => 'best_ac_submissions, submissions', 'table_config' => $table_config), $myUser); ?>
@@ -263,14 +311,6 @@ new Morris.Line({
 			<?php endif ?>
 		</div>
 	</div>
-	<ul class="nav nav-pills nav-fill flex-column" role="tablist">
-		<li class="nav-item text-start">
-			<a class="nav-link" href="/contest/<?= $contest['id'] ?>" role="tab">
-				<i class="bi bi-arrow-90deg-left"></i>
-				<?= UOJLocale::get('contests::back to the contest') ?>
-			</a>
-		</li>
-	</ul>
 	<div class="card-footer bg-transparent">
 		比赛评价：<?= getClickZanBlock('C', $contest['id'], $contest['zan']) ?>
 	</div>