删除旧的codegraph

- judge_client 在 solution/problem/source 查询失败时记录系统错误并以 OJ_RE 安全退出，避免判题机崩溃或挂起
- submit.php 抽取 submit_error 助手，AJAX 请求返回纯文本错误，提交页改为 AJAX 流程并增强错误提示
- 修复 reinfo 自动刷新脚本在标签页切回前台后未恢复轮询的 bug

README.md

@@ -1,5 +1,7 @@
 # 调试说明
 
+该项目为局域网本地项目。不需要考虑安全问题。
+
 ## 调试环境
 
 - 目标网址：http://192.168.0.96/
@@ -15,3 +17,11 @@
 3. 打开网页端提供的 git pull API 触发更新，使服务器拉取最新代码。
 
 如需验证调试环境，优先使用上述账号登录目标网址，并通过网页端 git pull API 完成代码同步。
+
+## 数据库
+```
+static 	$DB_HOST="localhost";  //数据库服务器ip或域名
+static 	$DB_NAME="jol";   //数据库名
+static 	$DB_USER="debian-sys-maint";  //数据库账户
+static 	$DB_PASS="GJfFMuAmScKHHa32";  //数据库密码
+```

core/judge_client/judge_client.cc

@@ -1220,6 +1220,17 @@ void addreinfo(int solution_id)
 	}
 }
 
+void add_system_error_info(int solution_id, const char *message)
+{
+	FILE *fp = fopen("error.out", "a");
+	if (fp != NULL)
+	{
+		fprintf(fp, "system:%s\n", message);
+		fclose(fp);
+	}
+	addreinfo(solution_id);
+}
+
 void adddiffinfo(int solution_id)
 {
 
@@ -1670,7 +1681,7 @@ int check_mysql_conn(){
 #endif
 
 #ifdef _mysql_h
-void _get_solution_mysql(int solution_id, char *work_dir, int lang)
+bool _get_solution_mysql(int solution_id, char *work_dir, int lang)
 {
 	char sql[BUFFER_SIZE], src_pth[BUFFER_SIZE];
 	// get the source code
@@ -1678,7 +1689,8 @@ void _get_solution_mysql(int solution_id, char *work_dir, int lang)
 	MYSQL_ROW row;
 	sprintf(sql, "SELECT source FROM source_code WHERE solution_id=%d",
 			solution_id);
-	mysql_real_query(conn, sql, strlen(sql));
+	if (mysql_real_query(conn, sql, strlen(sql)))
+		return false;
 	res = mysql_store_result(conn);
 
 	// create the src file
@@ -1691,16 +1703,23 @@ void _get_solution_mysql(int solution_id, char *work_dir, int lang)
 			if (DEBUG)
 				printf("Main=%s", src_pth);
 			FILE *fp_src = fopen(src_pth, "we");
+			if (fp_src == NULL) {
+				mysql_free_result(res);
+				return false;
+			}
 			fprintf(fp_src, "%s", row[0]);
 			mysql_free_result(res); // free the memory
 			res = NULL;
 			row = NULL;
 			fclose(fp_src);
+			return true;
 		}
+		mysql_free_result(res);
 	}
+	return false;
 }
 #endif
-void _get_solution_http(int solution_id, char *work_dir, int lang)
+bool _get_solution_http(int solution_id, char *work_dir, int lang)
 {
 	char src_pth[BUFFER_SIZE];
 
@@ -1716,22 +1735,26 @@ void _get_solution_http(int solution_id, char *work_dir, int lang)
 	FILE *pout = read_cmd_output(cmd2, solution_id, src_pth, http_baseurl, http_apipath);
 
 	pclose(pout);
+	return access(src_pth, R_OK) == 0;
 }
-void get_solution(int solution_id, char *work_dir, int lang,int p_id)
+bool get_solution(int solution_id, char *work_dir, int lang,int p_id)
 {
 	char src_pth[BUFFER_SIZE];
+	bool ret = false;
 	sprintf(src_pth, "Main.%s", lang_ext[lang]);
 	if (http_judge)
 	{
-		_get_solution_http(solution_id, work_dir, lang);
+		ret = _get_solution_http(solution_id, work_dir, lang);
 	}
 	else
 	{
 
 #ifdef _mysql_h
-		_get_solution_mysql(solution_id, work_dir, lang);
+		ret = _get_solution_mysql(solution_id, work_dir, lang);
 #endif
 	}
+	if (!ret)
+		return false;
 	if(lang == LANG_PYTHON ){    // 从源码中搜索python2字样，失败的结果非零默认python3,成功的结果为0是python2
 		py2 = execute_cmd("/bin/grep 'python2' %s/Main.py > /dev/null", work_dir);
                 execute_cmd("sed -i 's/import.*os//g' %s/%s", work_dir, src_pth);
@@ -1740,6 +1763,7 @@ void get_solution(int solution_id, char *work_dir, int lang,int p_id)
                 execute_cmd("cp %s/../data/%d/sb3/%d.sb3 %s", work_dir,p_id,solution_id, src_pth);
 	}
 	execute_cmd("chown judge %s/%s", work_dir, src_pth);
+	return access(src_pth, R_OK) == 0;
 }
 
 #ifdef _mysql_h
@@ -1804,7 +1828,7 @@ void get_custominput(int solution_id, char *work_dir)
 }
 
 #ifdef _mysql_h
-void _get_solution_info_mysql(int solution_id, int & p_id, char * user_id,
+bool _get_solution_info_mysql(int solution_id, int & p_id, char * user_id,
 		int & lang,int &cid) {
 
 	MYSQL_RES *res;
@@ -1818,7 +1842,8 @@ void _get_solution_info_mysql(int solution_id, int & p_id, char * user_id,
 				"insert into solution2 select *  FROM solution where solution_id=%d",
 				solution_id);
 		//printf("%s\n",sql);
-		mysql_real_query(conn, sql, strlen(sql));
+		if (mysql_real_query(conn, sql, strlen(sql)))
+			return false;
 		sprintf(sql,
 				"SELECT problem_id, user_id, language,contest_id FROM solution2 where solution_id=%d",
 				solution_id);
@@ -1831,9 +1856,16 @@ void _get_solution_info_mysql(int solution_id, int & p_id, char * user_id,
 				solution_id);
 	}
 	//printf("%s\n",sql);
-	mysql_real_query(conn, sql, strlen(sql));
+	if (mysql_real_query(conn, sql, strlen(sql)))
+		return false;
 	res = mysql_store_result(conn);
+	if (res == NULL)
+		return false;
 	row = mysql_fetch_row(res);
+	if (row == NULL) {
+		mysql_free_result(res);
+		return false;
+	}
 	p_id = atoi(row[0]);
 	strcpy(user_id, row[1]);
 	lang = atoi(row[2]);
@@ -1844,9 +1876,10 @@ void _get_solution_info_mysql(int solution_id, int & p_id, char * user_id,
 		mysql_free_result(res);                         // free the memory
 		res=NULL;
 	}
+	return true;
 }
 #endif
-void _get_solution_info_http(int solution_id, int & p_id, char * user_id,
+bool _get_solution_info_http(int solution_id, int & p_id, char * user_id,
 		int & lang,int & cid) {
 
 	login();
@@ -1854,26 +1887,29 @@ void _get_solution_info_http(int solution_id, int & p_id, char * user_id,
 	const char *cmd =
 		"wget --post-data=\"getsolutioninfo=1&sid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s%s\"";
 	FILE *pout = read_cmd_output(cmd, solution_id, http_baseurl, http_apipath);
-	if(1!=fscanf(pout, "%d", &p_id))  printf("http problem_id read fail...\n");
+	bool ret = true;
-	if(1!=fscanf(pout, "%s", user_id)) printf("http user_id read fail ... \n") ;
+	if(1!=fscanf(pout, "%d", &p_id))  { printf("http problem_id read fail...\n"); ret = false; }
-	if(1!=fscanf(pout, "%d", &lang))   printf("http language read fail ... \n") ;
+	if(1!=fscanf(pout, "%s", user_id)) { printf("http user_id read fail ... \n") ; ret = false; }
-	if(1!=fscanf(pout, "%d", &cid))    printf("http contest_id read fail ... \n") ;
+	if(1!=fscanf(pout, "%d", &lang))   { printf("http language read fail ... \n") ; ret = false; }
+	if(1!=fscanf(pout, "%d", &cid))    { printf("http contest_id read fail ... \n") ; ret = false; }
 	pclose(pout);
+	return ret;
 }
-void get_solution_info(int solution_id, int & p_id, char * user_id,
+bool get_solution_info(int solution_id, int & p_id, char * user_id,
 		int & lang,int & cid) {
 
 	if (http_judge) {
-		_get_solution_info_http(solution_id, p_id, user_id, lang,cid);
+		return _get_solution_info_http(solution_id, p_id, user_id, lang,cid);
 	} else {
 #ifdef _mysql_h
-		_get_solution_info_mysql(solution_id, p_id, user_id, lang,cid);
+		return _get_solution_info_mysql(solution_id, p_id, user_id, lang,cid);
 #endif
 	}
+	return false;
 }
 
 #ifdef _mysql_h
-void _get_problem_info_mysql(int p_id, double &time_lmt, int &mem_lmt,
+bool _get_problem_info_mysql(int p_id, double &time_lmt, int &mem_lmt,
 							 int &spj)
 {
 	// get the problem info from Table:problem
@@ -1883,9 +1919,16 @@ void _get_problem_info_mysql(int p_id, double &time_lmt, int &mem_lmt,
 	sprintf(sql,
 			"SELECT time_limit,memory_limit,spj FROM problem where problem_id=%d",
 			p_id);
-	mysql_real_query(conn, sql, strlen(sql));
+	if (mysql_real_query(conn, sql, strlen(sql)))
+		return false;
 	res = mysql_store_result(conn);
+	if (res == NULL)
+		return false;
 	row = mysql_fetch_row(res);
+	if (row == NULL) {
+		mysql_free_result(res);
+		return false;
+	}
 	time_lmt = atof(row[0]);
 	mem_lmt = atoi(row[1]);
 	spj = atoi(row[2]);
@@ -1894,9 +1937,10 @@ void _get_problem_info_mysql(int p_id, double &time_lmt, int &mem_lmt,
 		mysql_free_result(res); // free the memory
 		res = NULL;
 	}
+	return true;
 }
 #endif
-void _get_problem_info_http(int p_id, double &time_lmt, int &mem_lmt,
+bool _get_problem_info_http(int p_id, double &time_lmt, int &mem_lmt,
 							int &spj)
 {
 	//login();
@@ -1904,27 +1948,32 @@ void _get_problem_info_http(int p_id, double &time_lmt, int &mem_lmt,
 	const char *cmd =
 		"wget --post-data=\"getprobleminfo=1&pid=%d\" --load-cookies=cookie --save-cookies=cookie --keep-session-cookies -q -O - \"%s%s\"";
 	FILE *pout = read_cmd_output(cmd, p_id, http_baseurl, http_apipath);
-	if(1!=fscanf(pout, "%lf", &time_lmt)) printf("http read time_limit fail...\n");
+	bool ret = true;
-	if(1!=fscanf(pout, "%d", &mem_lmt)  ) printf("http read memory_limit fail...\n");
+	if(1!=fscanf(pout, "%lf", &time_lmt)) { printf("http read time_limit fail...\n"); ret = false; }
-	if(1!=fscanf(pout, "%d", &spj)    ) printf("http read special judge fail...\n");
+	if(1!=fscanf(pout, "%d", &mem_lmt)  ) { printf("http read memory_limit fail...\n"); ret = false; }
+	if(1!=fscanf(pout, "%d", &spj)    ) { printf("http read special judge fail...\n"); ret = false; }
 	pclose(pout);
 	if(DEBUG) printf("time_lmt:%g\n",time_lmt);
+	return ret;
 }
 
-void get_problem_info(int p_id, double &time_lmt, int &mem_lmt, int &spj)
+bool get_problem_info(int p_id, double &time_lmt, int &mem_lmt, int &spj)
 {
 	if (http_judge)
 	{
-		_get_problem_info_http(p_id, time_lmt, mem_lmt, spj);
+		if (!_get_problem_info_http(p_id, time_lmt, mem_lmt, spj))
+			return false;
 	}
 	else
 	{
 #ifdef _mysql_h
-		_get_problem_info_mysql(p_id, time_lmt, mem_lmt, spj);
+		if (!_get_problem_info_mysql(p_id, time_lmt, mem_lmt, spj))
+			return false;
 #endif
 	}
 	if (time_lmt <= 0)
 		time_lmt = 1;
+	return true;
 }
 char *escape(char s[], char t[])
 {
@@ -3455,6 +3504,8 @@ int main(int argc, char **argv)
 	double time_lmt;
 	char time_space_table[BUFFER_SIZE*100];
 	int time_space_index=0;
+	time_space_table[0]=0;
+	user_id[0]=0;
         umask(0077);
 	init_parameters(argc, argv, solution_id, runner_id);
 
@@ -3489,7 +3540,27 @@ int main(int argc, char **argv)
 
 	if (http_judge)
 		if(!system("/bin/ln -s ../cookie ./")) printf("cookie link fail \n");
-	get_solution_info(solution_id, p_id, user_id, lang,cid);
+	if (!get_solution_info(solution_id, p_id, user_id, lang,cid)) {
+		add_system_error_info(solution_id, "solution info not found");
+		update_solution(solution_id, OJ_RE, 0, 0, 0, 0, 0.0);
+#ifdef _mysql_h
+		if (!http_judge)
+			mysql_close(conn);
+#endif
+		clean_workdir(work_dir);
+		exit(0);
+	}
+	if (lang < 0 || lang >= (int)(sizeof(lang_ext) / sizeof(lang_ext[0]))) {
+		add_system_error_info(solution_id, "invalid language id");
+		update_solution(solution_id, OJ_RE, 0, 0, 0, 0, 0.0);
+		if(!turbo_mode)update_user(user_id);
+#ifdef _mysql_h
+		if (!http_judge)
+			mysql_close(conn);
+#endif
+		clean_workdir(work_dir);
+		exit(0);
+	}
 	//get the limit
 
 	if (p_id == 0)
@@ -3500,11 +3571,33 @@ int main(int argc, char **argv)
 	}
 	else
 	{
-		get_problem_info(p_id, time_lmt, mem_lmt, spj);
+		if (!get_problem_info(p_id, time_lmt, mem_lmt, spj)) {
+			add_system_error_info(solution_id, "problem info not found");
+			update_solution(solution_id, OJ_RE, 0, 0, 0, 0, 0.0);
+			if(!turbo_mode)update_user(user_id);
+			if(!turbo_mode)update_problem(p_id,cid);
+#ifdef _mysql_h
+			if (!http_judge)
+				mysql_close(conn);
+#endif
+			clean_workdir(work_dir);
+			exit(0);
+		}
 	}
 	//copy source file
 
-	get_solution(solution_id, work_dir, lang,p_id);
+	if (!get_solution(solution_id, work_dir, lang,p_id)) {
+		add_system_error_info(solution_id, "source code not found");
+		update_solution(solution_id, OJ_RE, 0, 0, 0, 0, 0.0);
+		if(!turbo_mode)update_user(user_id);
+		if(!turbo_mode)update_problem(p_id,cid);
+#ifdef _mysql_h
+		if (!http_judge)
+			mysql_close(conn);
+#endif
+		clean_workdir(work_dir);
+		exit(0);
+	}
 
 	//java and other VM language are lucky to have the global bonus in judge.conf
 	if (lang >= LANG_JAVA && lang != LANG_OBJC && lang != LANG_CLANG && lang != LANG_CLANGPP  && lang != LANG_GO )
@@ -3581,11 +3674,18 @@ int main(int argc, char **argv)
 	if(p_id > 0 && namelist_len == -1 ){
 		
 		write_log("No such dir:%s!\n", fullpath);
+		char error[BUFFER_SIZE];
+		snprintf(error, BUFFER_SIZE - 1, "test data directory not found: %s", fullpath);
+		add_system_error_info(solution_id, error);
+		update_solution(solution_id, OJ_RE, 0, 0, 0, 0, 0.0);
+		if(!turbo_mode)update_user(user_id);
+		if(!turbo_mode)update_problem(p_id,cid);
 #ifdef _mysql_h
 		if (!http_judge)
 			mysql_close(conn);
 #endif
-		exit(-1);
+		clean_workdir(work_dir);
+		exit(0);
 	
 	}else{
 		if(DEBUG){
@@ -3702,6 +3802,7 @@ int main(int argc, char **argv)
 		
 	}
 	char last_name[BUFFER_SIZE];
+	last_name[0]=0;
 	int minus_mark=0;
 	char path_buf[BUFFER_SIZE];
 	sprintf(path_buf,"%s/data/%d/",oj_home,p_id);

web/include/db_info.inc.php

@@ -81,7 +81,7 @@ static  $OJ_BENCHMARK_MODE=false; //此选项仅供测试用，不是正常功
 static  $OJ_CONTEST_RANK_FIX_HEADER=false; //比赛排名水平滚动时固定名单
 static  $OJ_NOIP_KEYWORD="noip";  // 标题包含此关键词，激活noip模式，赛中不显示结果，仅保留最后一次提交。
 static  $OJ_BEIAN=false;  // 如果有备案号，填写备案号
-static  $OJ_RANK_HIDDEN="'admin','super','szx','sen'";  // 管理员不显示在排名中
+static  $OJ_RANK_HIDDEN="'admin','super','szx','sen','copilot'";  // 管理员不显示在排名中
 static  $OJ_FRIENDLY_LEVEL=0; //系统友好级别，暂定0-9级，级别越高越傻瓜，系统易用度高的同时将降低安全性，仅供非专业用途，造成泄题、抄袭概不负责。
 static  $OJ_FREE_PRACTICE=true; //自由练习，不受比赛作业用题限制
 static  $OJ_SUBMIT_COOLDOWN_TIME=1; //提交冷却时间，连续两次提交的最小间隔，单位秒。

web/reinfo.php

@@ -102,6 +102,145 @@ function dedup_runtimeinfo($text, &$dedup_count) {
   return implode("\n", $out);
 }
 
+/**
+ * 把 runtimeinfo.error 解析为结构化的 diff blocks
+ * 返回 [['name' => 'test1.out', 'expected' => [...], 'yours' => [...], 'full_mode' => bool], ...]
+ * 解析失败返回空数组
+ */
+function parse_diff_blocks($text) {
+  $blocks = array();
+  if (empty($text)) return $blocks;
+
+  // 先按 "\n\n" 切分（simple mode 每个测试点之间有空行）
+  $chunks = preg_split('/\n\s*\n/', $text);
+  foreach ($chunks as $chunk) {
+    $chunk = trim($chunk);
+    if ($chunk === '') continue;
+
+    // 格式 1: 整段就是一个 =====[name]===== 块（包含表头+数据+结尾 ====）
+    // 形如 "========[test1.out]========\nExpected     | Yours\nFail | Fall\n=============================="
+    if (preg_match('/^=+\[([^\]]+)\]\=+(.+?)\n=+\s*$/s', $chunk, $m)) {
+      $name = trim($m[1]);
+      $body = $m[2];
+      // body 形如 "\nExpected     | Yours\nFail | Fall"
+      // 去掉首尾的换行符
+      $body = trim($body, "\n\r");
+      $lines_in_body = explode("\n", $body);
+      $expected = array();
+      $yours = array();
+      $found_header = false;
+      foreach ($lines_in_body as $bl) {
+        $bl = rtrim($bl);
+        if ($bl === '') continue;
+        // 跳过表头
+        if (!$found_header && preg_match('/^Expected.*\|.*Yours/i', $bl)) {
+          $found_header = true;
+          continue;
+        }
+        if (!$found_header && (preg_match('/^\|?--\s*\|/', $bl) || trim($bl) === '--')) {
+          continue;
+        }
+        $parsed = parse_one_diff_line($bl);
+        if ($parsed !== null) {
+          $expected[] = $parsed[0];
+          $yours[] = $parsed[1];
+          $found_header = true;
+        } else {
+          $expected[] = $bl;
+          $yours[] = '';
+          $found_header = true;
+        }
+      }
+      if (!empty($expected)) {
+        $blocks[] = array(
+          'name' => $name,
+          'expected' => $expected,
+          'yours'    => $yours,
+          'full_mode' => true,
+        );
+      }
+      continue;
+    }
+
+    // 格式 2: simple mode "test1.out\n--\n|Expected|Yours\n|--|--\n|row1|row2"
+    if (preg_match('/^([^\n=|]+)\n--\n([\s\S]+)$/', $chunk, $m)) {
+      $name = trim($m[1]);
+      $body = $m[2];
+      $lines_in_body = explode("\n", $body);
+      $expected = array();
+      $yours = array();
+      $found_header = false;
+      foreach ($lines_in_body as $bl) {
+        $bl = rtrim($bl);
+        if ($bl === '') continue;
+        if (!$found_header && preg_match('/Expected.*\|.*Yours/i', $bl)) {
+          $found_header = true;
+          continue;
+        }
+        if (!$found_header && (preg_match('/^\|?--\s*\|/', $bl) || trim($bl) === '--')) {
+          continue;
+        }
+        $parsed = parse_one_diff_line($bl);
+        if ($parsed !== null) {
+          $expected[] = $parsed[0];
+          $yours[] = $parsed[1];
+          $found_header = true;
+        } else {
+          $expected[] = $bl;
+          $yours[] = '';
+          $found_header = true;
+        }
+      }
+      if (!empty($expected)) {
+        $blocks[] = array(
+          'name' => $name,
+          'expected' => $expected,
+          'yours'    => $yours,
+          'full_mode' => false,
+        );
+      }
+    }
+  }
+  return $blocks;
+}
+
+/**
+ * 解析单行 "expected | yours" 格式
+ * 支持 "|a|b"、"a | b"、"a|b" 等
+ * 返回 [left, right] 或 null（无法解析）
+ */
+function parse_one_diff_line($line) {
+  $line = rtrim($line);
+  if ($line === '') return null;
+
+  // 格式 A: "|a|b" (首尾带 |)
+  if ($line[0] === '|') {
+    $rest = substr($line, 1);
+    $pos = strpos($rest, '|');
+    if ($pos !== false) {
+      return array(substr($rest, 0, $pos), substr($rest, $pos + 1));
+    }
+  }
+
+  // 格式 B: "a | b" 或 "a  |  b"（带空格的 markdown 风格）
+  // 注意：可能行内有空格，所以用 " | " 或 "  |  " 等宽松匹配
+  if (preg_match('/^(.*?)\s+\|\s+(.*)$/', $line, $m)) {
+    // 确保左右两边都非空
+    $left = trim($m[1]);
+    $right = trim($m[2]);
+    if ($left !== '' || $right !== '') {
+      return array($left, $right);
+    }
+  }
+
+  // 格式 C: "a<b" 或 "a>b"（diff -y 风格）
+  if (preg_match('/^(.*?)\s+([<>])\s+(.*)$/', $line, $m)) {
+    return array($m[1], $m[3]);
+  }
+
+  return null;
+}
+
 $view_reinfo = "";
 $view_reinfo_raw = "";     // 原始（管理员/有权限者看）
 $view_reinfo_summary = ""; // 折叠后（普通用户看）
@@ -120,7 +259,9 @@ if($ok){
   $rt = pdo_query($sql,$id);
   $raw_error = "";
   if(isset($rt[0])){
-    $raw_error = str_replace("\n\r","\n",$rt[0]['error']);
+    $raw_error = $rt[0]['error'];
+    // 统一换行符：先替换 \r\n，再替换单独的 \r
+    $raw_error = str_replace(array("\r\n", "\r"), "\n", $raw_error);
   }
 
   // === 阶段 1：基于 solution.result 给"主解释"（永远非空）===
@@ -203,6 +344,9 @@ if($ok){
 
   $view_reinfo = $view_reinfo_summary;
 
+  // 尝试解析为结构化的 diff 数据（用于 WA/PE/AC 时的对比展示）
+  $diff_blocks = parse_diff_blocks($raw_error);
+
   // 管理员或 source_browser 永远看完整原文
   $show_raw = $is_admin_session || $is_source_browser;
   if ($show_raw) {

web/submit.php

@@ -3,19 +3,37 @@ require_once "include/db_info.inc.php";
 require_once "include/my_func.inc.php";
 require_once "include/email.class.php";
 require_once "include/base64.php";
+require_once "include/const.inc.php";
+
+$is_ajax_submit = isset($_GET['ajax']) || isset($_POST['ajax']);
+
+function submit_error($message) {
+  global $OJ_TEMPLATE, $is_ajax_submit, $view_errors;
+
+  if ($is_ajax_submit) {
+    header("Content-Type: text/plain; charset=UTF-8");
+    $text = trim(html_entity_decode(strip_tags($message), ENT_QUOTES, "UTF-8"));
+    if ($text === "") {
+      $text = "Submit failed.";
+    }
+    echo $text;
+    exit(0);
+  }
+
+  $view_errors = $message;
+  require "template/".$OJ_TEMPLATE."/error.php";
+  exit(0);
+}
 
 if(isset($OJ_CSRF) && $OJ_CSRF && $OJ_TEMPLATE=="syzoj" && !isset($_SESSION[$OJ_NAME.'_'.'http_judge']))
   require_once(dirname(__FILE__)."/include/csrf_check.php");
 
 if (!isset($_SESSION[$OJ_NAME . '_' . 'user_id'])) {
  
-	$view_errors = "<a href=loginpage.php>$MSG_Login</a>";
+	submit_error("<a href=loginpage.php>$MSG_Login</a>");
-	require("template/".$OJ_TEMPLATE."/error.php");
-	exit(0);
 }
 
 require_once "include/memcache.php";
-require_once "include/const.inc.php";
 
 $now = strftime("%Y-%m-%d %H:%M", time());
 $user_id = $_SESSION[$OJ_NAME.'_'.'user_id'];
@@ -41,10 +59,8 @@ if (!$OJ_BENCHMARK_MODE) {
     $_SESSION[$OJ_NAME.'_'."vcode"] = null;
     $err_str = $err_str.$MSG_VCODE_WRONG."\n";
     $err_cnt++;
-    $view_errors = $err_str;
     $_SESSION[ $OJ_NAME . '_' . "vfail" ]=true;
-    require "template/".$OJ_TEMPLATE."/error.php";
+    submit_error($err_str);
-    exit(0);
   }else{
           $_SESSION[ $OJ_NAME . '_' . "vfail" ]=false;
   }
@@ -74,24 +90,13 @@ else {
 if(!$test_run){
 	$res = mysql_query_cache($sql);
 	if (isset($res) && count($res)<1 && !isset($_SESSION[$OJ_NAME.'_'.'administrator']) && !((isset($cid)&&$cid<=0) || (isset($id)&&$id<=0))) {
-	  $view_errors = $MSG_LINK_ERROR."<br>";
+	  submit_error($MSG_LINK_ERROR."<br>");
-	  require "template/".$OJ_TEMPLATE."/error.php";
-	  exit(0);
 	}
 }
-if ($res[0][1]!='N' && !($test_run||isset($_SESSION[$OJ_NAME.'_'.'administrator']))) {
+if (!$test_run && isset($res[0]) && $res[0][1]!='N' && !isset($_SESSION[$OJ_NAME.'_'.'administrator'])) {
    // echo "res:$res,count:".count($res);
    //  echo "$sql";
-  $view_errors = $MSG_PROBLEM_RESERVED."<br>";
+  submit_error($MSG_PROBLEM_RESERVED."<br>".$res[0][1]);
-
-  if (isset($_POST['ajax'])) {
-    echo $view_errors.$res[0][1];
-    exit(0);
-  }
-  else {
-    require "template/".$OJ_TEMPLATE."/error.php";
-  }
-  exit(0);
 }
 
 $title = "";
@@ -118,10 +123,7 @@ else if (isset($_POST['pid']) && isset($_POST['cid']) && $_POST['cid']!=0) {
   $rows_cnt = count($result);
 
   if ($rows_cnt != 1) {
-    $view_errors .= $MSG_NOT_IN_CONTEST;
+    submit_error($MSG_NOT_IN_CONTEST);
-
-    require "template/" . $OJ_TEMPLATE . "/error.php";
-    exit(0);
   }
   else {
     $row = $result[0];
@@ -137,9 +139,7 @@ else if (isset($_POST['pid']) && isset($_POST['cid']) && $_POST['cid']!=0) {
       $ccnt = intval($row[0]);
 
       if ($ccnt==0 && !isset($_SESSION[$OJ_NAME.'_'.'administrator'])) {
-        $view_errors = $MSG_NOT_INVITED."\n";
+        submit_error($MSG_NOT_INVITED."\n");
-        require "template/" . $OJ_TEMPLATE . "/error.php";
-        exit(0);
       }
     }
   }
@@ -150,9 +150,7 @@ else if (isset($_POST['pid']) && isset($_POST['cid']) && $_POST['cid']!=0) {
   $rows_cnt = count($result);
 
   if ($rows_cnt != 1) {
-    $view_errors = $MSG_NO_PROBLEM."\n";
+    submit_error($MSG_NO_PROBLEM."\n");
-    require "template/".$OJ_TEMPLATE."/error.php";
-    exit(0);
   }
   else {
     $row = $result[0];
@@ -182,12 +180,10 @@ if ($language > count($language_name) || $language < 0) {
 $language = strval($language);
 
 if ($langmask&(1<<$language)) {
-  $view_errors = $MSG_NO_PLS."\n[$language][$langmask][".($langmask&(1<<$language))."]";
+  submit_error($MSG_NO_PLS."\n[$language][$langmask][".($langmask&(1<<$language))."]");
-  require "template/".$OJ_TEMPLATE."/error.php";
-  exit(0);
 }
 
-$source = $_POST['source'];
+$source = isset($_POST['source']) ? $_POST['source'] : "";
 $input_text = "";
 
 if (isset($_POST['input_text'])) {
@@ -206,7 +202,7 @@ if ($test_run) {
   $id = -$id;
 }
 
-$tempfile = $_FILES ["answer"] ["tmp_name"];
+$tempfile = (isset($_FILES["answer"]) && isset($_FILES["answer"]["tmp_name"])) ? $_FILES["answer"]["tmp_name"] : "";
 if($tempfile!=""){
 	if($language!=23){
 
@@ -217,7 +213,7 @@ if($tempfile!=""){
 		$source="Main.sb3";
 	}
 }
-$origin_name=trim($_FILES ["answer"]['name']);
+$origin_name=(isset($_FILES["answer"]) && isset($_FILES["answer"]['name'])) ? trim($_FILES["answer"]['name']) : "";
 $solution_file = "$OJ_DATA/$id/solution.name";
 if(file_exists($solution_file)){
         $solution_name=trim(file_get_contents($solution_file));
@@ -255,7 +251,7 @@ if ($test_run) {
   $id = 0;
 }
 
-if($language!=23) $len = strlen($source);else $len = $_FILES['answer']['size'];
+if($language!=23) $len = strlen($source);else $len = (isset($_FILES['answer']) ? intval($_FILES['answer']['size']) : 0);
 //echo $source;
 
 setcookie('lastlang', $language, time()+360000);
@@ -270,15 +266,11 @@ if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
 
 
 if ($len < 2) {
-  $view_errors = $MSG_TOO_SHORT.$tempfile."<br>";
+  submit_error($MSG_TOO_SHORT.$tempfile."<br>");
-  require "template/".$OJ_TEMPLATE."/error.php";
-  exit(0);
 }
 
 if ($len > 65536) {
-  $view_errors = $MSG_TOO_LONG."<br>";
+  submit_error($MSG_TOO_LONG."<br>");
-  require "template/" . $OJ_TEMPLATE . "/error.php";
-  exit(0);
 }
 
 if (!$OJ_BENCHMARK_MODE) {
@@ -295,8 +287,8 @@ if (!$OJ_BENCHMARK_MODE) {
     exit(0);
        // 预防WAF抽风
     */
-        if(isset($_GET['ajax'])){
+        if($is_ajax_submit){
-                echo -1;
+                submit_error(str_replace("10",$OJ_SUBMIT_COOLDOWN_TIME,$MSG_BREAK_TIME));
         }else{
                 $statusURI = "status.php?user_id=".$_SESSION[$OJ_NAME.'_'.'user_id'];
                 if (isset($cid)) {
@@ -373,15 +365,17 @@ if (~$OJ_LANGMASK&(1<<$language)) {
 
  ////remote oj
   $result=0;
-  $sql="select remote_oj from problem where problem_id=?";
+  if (!$test_run && isset($OJ_REMOTE_JUDGE) && $OJ_REMOTE_JUDGE) {
-  $remote_oj=pdo_query($sql,$id);
+    $sql="select remote_oj from problem where problem_id=?";
-  if(isset($remote_oj[0])){
+    $remote_oj=pdo_query($sql,$id);
-          $remote_oj=$remote_oj[0][0];
+    if(isset($remote_oj[0])){
-          if($remote_oj!=""){
+            $remote_oj=$remote_oj[0][0];
-                $result=16;
+            if($remote_oj!=""){
-                $sql="update solution set result=16,remote_oj=? where solution_id=?";
+                  $result=16;
-                pdo_query($sql,$remote_oj,$insert_id);
+                  $sql="update solution set result=16,remote_oj=? where solution_id=?";
-          }
+                  pdo_query($sql,$remote_oj,$insert_id);
+            }
+    }
   }
   
   ////poison robot account,give system resources to the REAL people
@@ -501,11 +495,11 @@ if (isset($cid)) {
   $statusURI .= "&cid=$cid&fixed=";
 }
 
-if (!$test_run&&!isset($_GET['ajax'])) {
+if (!$test_run&&!$is_ajax_submit) {
   header("Location: $statusURI");
 }
 else {
-  if (isset($_GET['ajax'])) {
+  if ($is_ajax_submit) {
     echo $insert_id;
   }
   else {

web/template/syzoj/reinfo.php

@@ -101,6 +101,20 @@
 #llm-section .ui.header {
     margin-top: 0;
 }
+#llm-section .llm-section-header {
+    transition: background-color 0.15s;
+    padding: 4px 8px;
+    margin-left: -8px;
+    margin-right: -8px;
+    border-radius: 4px;
+}
+#llm-section .llm-section-header:hover {
+    background-color: rgba(33,150,243,0.06);
+}
+#llm-section .llm-toggle-icon {
+    transition: transform 0.2s;
+    color: #888;
+}
 #llm-review-result {
     word-break: break-word;
 }
@@ -119,6 +133,99 @@ i.icon.spinning {
     color: #2185d0;
     font-weight: 600;
 }
+
+/* Diff 对比样式 */
+#diff-section {
+    margin-bottom: 18px;
+}
+.diff-card {
+    margin-bottom: 14px;
+    border-left: 4px solid #fbbd08;
+    padding: 12px 16px;
+}
+.diff-header {
+    display: flex;
+    align-items: center;
+    gap: 6px;
+    margin-bottom: 10px;
+    padding-bottom: 8px;
+    border-bottom: 1px solid #eee;
+    font-weight: 600;
+    color: #555;
+}
+.diff-name {
+    font-family: 'Fira Mono', 'Cascadia Code', Consolas, monospace;
+    font-size: 0.95em;
+}
+.diff-table {
+    display: grid;
+    grid-template-columns: 1fr 1fr;
+    gap: 12px;
+}
+@media (max-width: 768px) {
+    .diff-table { grid-template-columns: 1fr; }
+}
+.diff-side {
+    background: #fafafa;
+    border-radius: 6px;
+    overflow: hidden;
+    border: 1px solid #e0e0e0;
+}
+.diff-side-header {
+    padding: 6px 10px;
+    font-size: 0.85em;
+    font-weight: 600;
+    color: #fff;
+}
+.diff-expected .diff-side-header {
+    background: #21ba45;
+}
+.diff-yours .diff-side-header {
+    background: #db2828;
+}
+.diff-content {
+    margin: 0 !important;
+    padding: 8px 0 !important;
+    background: #fff !important;
+    font-family: 'Fira Mono', 'Cascadia Code', Consolas, monospace;
+    font-size: 0.85em;
+    line-height: 1.5;
+    overflow-x: auto;
+    max-height: 400px;
+    overflow-y: auto;
+}
+.diff-line {
+    display: flex;
+    align-items: flex-start;
+    padding: 0;
+    white-space: pre;
+}
+.diff-line-mismatch {
+    background: rgba(255, 230, 100, 0.25);
+}
+.diff-expected .diff-line-mismatch {
+    background: rgba(33, 186, 69, 0.12);
+}
+.diff-yours .diff-line-mismatch {
+    background: rgba(219, 40, 40, 0.10);
+}
+.diff-lineno {
+    display: inline-block;
+    min-width: 38px;
+    padding: 0 8px;
+    text-align: right;
+    color: #999;
+    background: #f5f5f5;
+    border-right: 1px solid #e8e8e8;
+    user-select: none;
+    flex-shrink: 0;
+}
+.diff-text {
+    padding: 0 10px;
+    flex: 1;
+    word-break: break-all;
+    white-space: pre-wrap;
+}
 </style>
 
 <div class="padding">
@@ -129,6 +236,8 @@ i.icon.spinning {
     $verdict_memory = isset($row['memory']) ? intval($row['memory']) : 0;
     $verdict_time   = isset($row['time']) ? intval($row['time']) : 0;
     $verdict_mark   = isset($mark) ? $mark : (isset($row['pass_rate']) ? round($row['pass_rate']*100, 1) : 0);
+    // 兜底：防止 PHP notice
+    $diff_blocks = isset($diff_blocks) && is_array($diff_blocks) ? $diff_blocks : array();
     ?>
 
     <!-- 1. 顶部判题结果横幅 -->
@@ -157,33 +266,58 @@ i.icon.spinning {
     </div>
 
 
-    <!-- 3. AI 点评区（直接显示按钮，提到原始错误上面） -->
+    <!-- 3. AI 点评区（标题可点击折叠/展开） -->
     <?php if (isset($OJ_LLM_ENABLED) && $OJ_LLM_ENABLED) { ?>
     <div class="ui raised segment" id="llm-section">
-        <h3 class="ui header">
+        <h3 class="ui header llm-section-header" id="llm-toggle" style="cursor: pointer; user-select: none;">
             <i class="magic icon"></i>
             <div class="content">
                 AI 智能点评
                 <div class="sub header"><?php echo isset($MSG_AI_REVIEW_DESC) ? $MSG_AI_REVIEW_DESC : '基于你的代码和判题结果分析'; ?></div>
             </div>
+            <i class="dropdown icon llm-toggle-icon" style="margin-left: auto; font-size: 1em;"></i>
         </h3>
-        <button class="ui labeled icon primary button" id="llm-review-btn" onclick="fetchLLMReview()">
+        <div id="llm-section-body">
-            <i class="magic icon"></i> 获取 AI 点评
+            <button class="ui labeled icon primary button" id="llm-review-btn" onclick="fetchLLMReview()">
-        </button>
+                <i class="magic icon"></i> 获取 AI 点评
-        <div id="llm-review-loading" class="ui active inline text loader" style="display:none; margin-left: 1em;">
+            </button>
-            AI 正在分析你的代码，请稍候...
+            <div id="llm-review-loading" class="ui active inline text loader" style="display:none; margin-left: 1em;">
-        </div>
+                AI 正在分析你的代码，请稍候...
-        <div id="llm-review-result" style="display:none; margin-top: 15px;">
+            </div>
-            <div class="ui existing segment" id="llm-review-content"></div>
+            <div id="llm-review-result" style="display:none; margin-top: 15px;">
-        </div>
+                <div class="ui existing segment" id="llm-review-content"></div>
-        <div id="llm-review-error" style="display:none; margin-top: 15px;">
+            </div>
-            <div class="ui negative message">
+            <div id="llm-review-error" style="display:none; margin-top: 15px;">
-                <p id="llm-review-error-msg"></p>
+                <div class="ui negative message">
+                    <p id="llm-review-error-msg"></p>
+                </div>
             </div>
         </div>
     </div>
 
     <script>
+        // 折叠/展开 AI 点评区
+        (function(){
+            var header = document.getElementById('llm-toggle');
+            var body = document.getElementById('llm-section-body');
+            var icon = header ? header.querySelector('.llm-toggle-icon') : null;
+            if (!header || !body) return;
+
+            header.addEventListener('click', function(e){
+                // 如果用户点击的是按钮本身，不要触发展开（按钮事件自己处理）
+                if (e.target.closest('button')) return;
+                var collapsed = body.style.display === 'none';
+                body.style.display = collapsed ? '' : 'none';
+                if (icon) {
+                    icon.className = collapsed
+                        ? 'dropdown icon llm-toggle-icon'
+                        : 'dropdown icon llm-toggle-icon active';
+                    // active class 让 Semantic UI 的箭头自动旋转 90°，但我们手写也行
+                    icon.style.transform = collapsed ? 'rotate(0deg)' : 'rotate(-90deg)';
+                }
+            });
+        })();
+
         function fetchLLMReview(){
             var btn = $('#llm-review-btn');
             btn.prop('disabled', true).addClass('loading');
@@ -291,6 +425,63 @@ i.icon.spinning {
     </script>
     <?php } ?>
 
+    <!-- 3.5. 对比详情（WA/PE 时显示，diff 视图） -->
+    <?php if (!empty($diff_blocks) && is_array($diff_blocks)): ?>
+    <div id="diff-section">
+        <h3 class="ui header" style="margin-top: 0;">
+            <i class="exchange icon"></i>
+            <div class="content">
+                输出对比
+                <div class="sub header">逐测试点对比期望输出和你的输出</div>
+            </div>
+        </h3>
+        <?php foreach ($diff_blocks as $idx => $block): ?>
+        <div class="ui segment diff-card">
+            <div class="diff-header">
+                <i class="file outline icon"></i>
+                <span class="diff-name"><?php echo htmlspecialchars($block['name'], ENT_QUOTES, 'UTF-8'); ?></span>
+            </div>
+            <div class="diff-table">
+                <div class="diff-side diff-expected">
+                    <div class="diff-side-header">
+                        <i class="check icon"></i> 期望输出
+                    </div>
+                    <pre class="diff-content"><?php
+                        $max = max(count($block['expected']), count($block['yours']));
+                        $lines_html = array();
+                        for ($li = 0; $li < $max; $li++) {
+                            $e = isset($block['expected'][$li]) ? $block['expected'][$li] : '';
+                            $y = isset($block['yours'][$li]) ? $block['yours'][$li] : '';
+                            $diff_class = ($e !== $y) ? ' diff-line-mismatch' : '';
+                            $line_no = $li + 1;
+                            $lines_html[] = '<div class="diff-line' . $diff_class . '" data-line="' . $line_no . '"><span class="diff-lineno">' . $line_no . '</span><span class="diff-text">' . htmlspecialchars($e, ENT_QUOTES, 'UTF-8') . '</span></div>';
+                        }
+                        echo implode('', $lines_html);
+                    ?></pre>
+                </div>
+                <div class="diff-side diff-yours">
+                    <div class="diff-side-header">
+                        <i class="bug icon"></i> 你的输出
+                    </div>
+                    <pre class="diff-content"><?php
+                        $max = max(count($block['expected']), count($block['yours']));
+                        $lines_html = array();
+                        for ($li = 0; $li < $max; $li++) {
+                            $e = isset($block['expected'][$li]) ? $block['expected'][$li] : '';
+                            $y = isset($block['yours'][$li]) ? $block['yours'][$li] : '';
+                            $diff_class = ($e !== $y) ? ' diff-line-mismatch' : '';
+                            $line_no = $li + 1;
+                            $lines_html[] = '<div class="diff-line' . $diff_class . '" data-line="' . $line_no . '"><span class="diff-lineno">' . $line_no . '</span><span class="diff-text">' . htmlspecialchars($y, ENT_QUOTES, 'UTF-8') . '</span></div>';
+                        }
+                        echo implode('', $lines_html);
+                    ?></pre>
+                </div>
+            </div>
+        </div>
+        <?php endforeach; ?>
+    </div>
+    <?php endif; ?>
+
     <!-- 4. 原始错误折叠（默认收起） -->
     <div class="ui styled accordion" id="raw-info-accordion">
         <div class="title">
@@ -338,11 +529,7 @@ i.icon.spinning {
             <a class="ui button" href="problem.php?id=<?php echo intval($row['problem_id']) ?>">
                 <i class="info circle icon"></i> <?php echo isset($MSG_VIEW_PROBLEM) ? $MSG_VIEW_PROBLEM : '查看题目'; ?>
             </a>
-            <?php if (isset($OJ_DOWNLOAD) && $OJ_DOWNLOAD && ($isRE || $row['result']==6)) { ?>
+
-            <a class="ui orange button" href="download.php?sid=<?php echo intval($id) ?>">
-                <i class="download icon"></i> <?php echo isset($MSG_DOWNLOAD_DATA) ? $MSG_DOWNLOAD_DATA : '下载测试数据'; ?>
-            </a>
-            <?php } ?>
         </div>
     </div>
 
@@ -463,6 +650,7 @@ i.icon.spinning {
   var maxInterval = 8000;    // 最长 8s
   var countdown = 0;
   var stopped = false;
+  var completed = false;
 
   function showStatus(text){
     var el = document.getElementById('auto-refresh-status');
@@ -501,6 +689,7 @@ i.icon.spinning {
           // 判题完成，刷新页面拿到完整错误信息
           showStatus('判题完成，正在刷新...');
           setTimeout(function(){ location.reload(); }, 400);
+          completed = true;
           stopped = true;
           return;
         }
@@ -525,7 +714,8 @@ i.icon.spinning {
     if (document.hidden) {
       stopped = true;
       hideStatus();
-    } else if (!stopped) {
+    } else if (!completed) {
+      stopped = false;
       countdown = 0;
       tick();
     }

web/template/syzoj/submitpage.php

@@ -215,6 +215,15 @@
     border-top: 1px solid rgba(0,0,5,0.08);
 }
 
+.submit-top-actions {
+    justify-content: flex-end;
+    padding-top: 0;
+    padding-bottom: 16px;
+    margin-bottom: 16px;
+    border-top: 0;
+    border-bottom: 1px solid rgba(0,0,5,0.08);
+}
+
 .submit-actions .actions-left {
     display: flex;
     gap: 8px;
@@ -388,7 +397,15 @@
     </div>
 
     <script src="<?php echo $OJ_CDN_URL?>include/checksource.js"></script>
-    <form id="frmSolution" action="submit.php<?php if (isset($_GET['spa'])) echo "?spa" ?>" method="post" onsubmit="do_submit()" enctype="multipart/form-data">
+    <form id="frmSolution" action="submit.php<?php if (isset($_GET['spa'])) echo "?spa" ?>" method="post" onsubmit="do_submit();return false;" enctype="multipart/form-data">
+
+      <div class="submit-actions submit-top-actions">
+        <div class="actions-left">
+          <button id="Submit" type="button" class="btn btn-primary" onclick="do_submit();">
+            <i class="paper plane icon"></i> <?php echo $MSG_SUBMIT?>
+          </button>
+        </div>
+      </div>
 
       <div class="submit-toolbar">
         <?php if (!isset($_GET['spa']) || $solution_name ) {?>
@@ -485,11 +502,9 @@
         <h2 class="solution-name-title">📎 <?php echo $solution_name?></h2>
       <?php } ?>
 
+      <?php if ((isset($OJ_TEST_RUN) && $OJ_TEST_RUN && $spj<=1 && !$solution_name) || (isset($OJ_ENCODE_SUBMIT)&&$OJ_ENCODE_SUBMIT) || (isset($OJ_BLOCKLY)&&$OJ_BLOCKLY)){?>
       <div class="submit-actions">
         <div class="actions-left">
-          <button id="Submit" type="button" class="btn btn-primary" onclick="do_submit();">
-            <i class="paper plane icon"></i> <?php echo $MSG_SUBMIT?>
-          </button>
           <?php if ( isset($OJ_TEST_RUN) && $OJ_TEST_RUN && $spj<=1 && !$solution_name  ){?>
             <button id="TestRun" type="button" class="btn btn-info" onclick="do_test_run();">
               <i class="play icon"></i> <?php echo $MSG_TR?>
@@ -508,13 +523,14 @@
             <input id="blockly_loader" type="button" class="btn btn-purple" onclick="openBlockly()" value="🧩 <?php echo $MSG_BLOCKLY_OPEN?>">
             <input id="transrun" type="button" class="btn btn-green" onclick="loadFromBlockly()" value="▶ <?php echo $MSG_BLOCKLY_TEST?>" style="display:none;">
           </div>
-        <?php }?>
+          <?php }?>
       </div>
+      <?php }?>
 
       <div id="blockly" class="center"></div>
 
       <?php if (isset($id)){?>
-        <input id="problem_id" type="hidden" value="<?php echo $id?>" name="problem_id">
+        <input id="problem_id" type="hidden" value="<?php echo $id?>" name="id">
       <?php }else{?>
         <input id="cid" type="hidden" value="<?php echo $cid?>" name="cid">
         <input id="pid" type="hidden" value="<?php echo $pid?>" name="pid">
@@ -618,6 +634,69 @@ return ret+"";
 }
 var count=0;
 
+function htmlEscape(text){
+	return $("<div>").text(text).html();
+}
+
+function cleanSubmitMessage(data){
+	var text=$("<div>").html(String(data)).text();
+	text=$.trim(text.replace(/\s+/g," "));
+	if(text=="") text="Submit failed.";
+	return text;
+}
+
+function showSubmitMessage(data){
+	var tb=window.document.getElementById('result');
+	var text=cleanSubmitMessage(data);
+	if(tb!=null){
+		tb.innerHTML="<span class='badge badge-danger'>"+htmlEscape(text)+"</span>";
+	}else{
+		alert(text);
+	}
+	if($("#vcode-img")!=null) $("#vcode-img").click();
+}
+
+function setSubmitDisabled(disabled){
+	$("#Submit").prop('disabled', disabled);
+	$("#TestRun").prop('disabled', disabled);
+}
+
+function startSubmitCooldown(){
+	count=<?php echo isset($OJ_SUBMIT_COOLDOWN_TIME)?$OJ_SUBMIT_COOLDOWN_TIME:5 ?> * 2 ;
+	handler_interval= window.setTimeout("resume();",1000);
+}
+
+function submitSolutionAjax(isTestRun){
+	var form=document.getElementById("frmSolution");
+	var formData=new FormData(form);
+	$.ajax({
+		url:"submit.php?ajax<?php if(isset($_GET['spa'])) echo '&spa'; ?>",
+		type:"POST",
+		data:formData,
+		processData:false,
+		contentType:false,
+		success:function(data){
+			var text=$.trim(String(data));
+			var sid=/^\d+$/.test(text)?parseInt(text,10):0;
+			if(sid>0){
+				if(isTestRun){
+					fresh_result(sid);
+					startSubmitCooldown();
+				}else{
+					window.location.href="reinfo.php?sid="+sid;
+				}
+			}else{
+				showSubmitMessage(text);
+				setSubmitDisabled(false);
+			}
+		},
+		error:function(xhr){
+			showSubmitMessage(xhr.responseText || "Submit failed.");
+			setSubmitDisabled(false);
+		}
+	});
+}
+
 function encoded_submit(){
 
       var mark="<?php echo isset($id)?'problem_id':'cid';?>";
@@ -643,7 +722,7 @@ function encoded_submit(){
 }
 
 function do_submit(){
-	 $("#Submit").attr("disabled","true");
+	 setSubmitDisabled(true);
 	if(using_blockly)
 		 translate();
 	if(typeof(editor) != "undefined"){
@@ -656,37 +735,8 @@ function do_submit(){
 	else
 	problem_id.value='<?php if (isset($cid))echo $cid?>';
 	document.getElementById("frmSolution").target="_self";
-
+	submitSolutionAjax(false);
-<?php if(isset($_GET['spa'])){?>
+	<?php if(isset($OJ_REMOTE_JUDGE)&&$OJ_REMOTE_JUDGE) {?>$("#sk").attr("src","remote.php"); <?php } ?>
-	<?php if($solution_name) { ?>document.getElementById("frmSolution").submit(); <?php } ?>
-        $.post("submit.php?ajax",$("#frmSolution").serialize(),function(data){
-		var sid=parseInt(data);
-		if(sid>0){
-			window.location.href="reinfo.php?sid="+sid;
-		}else{
-			fresh_result(data);
-		}
-	});
-        $("#Submit").prop('disabled', true);
-        $("#TestRun").prop('disabled', true);
-        count=<?php echo $OJ_SUBMIT_COOLDOWN_TIME?> * 2 ;
-        handler_interval= window.setTimeout("resume();",1000);
-	 <?php if(isset($OJ_REMOTE_JUDGE)&&$OJ_REMOTE_JUDGE) {?>$("#sk").attr("src","remote.php"); <?php } ?>
-<?php }else{?>
-        $.post("submit.php?ajax",$("#frmSolution").serialize(),function(data){
-		var sid=parseInt(data);
-		if(sid>0){
-			window.location.href="reinfo.php?sid="+sid;
-		}else{
-			fresh_result(data);
-		}
-	});
-        $("#Submit").prop('disabled', true);
-        $("#TestRun").prop('disabled', true);
-        count=<?php echo $OJ_SUBMIT_COOLDOWN_TIME?> * 2 ;
-        handler_interval= window.setTimeout("resume();",1000);
-<?php }?>
-
 }
 var handler_interval;
 function do_test_run(){
@@ -705,12 +755,9 @@ function do_test_run(){
 	var problem_id=document.getElementById(mark);
 	problem_id.value=-problem_id.value;
 	document.getElementById("frmSolution").target="testRun";
-	$.post("submit.php?ajax",$("#frmSolution").serialize(),function(data){fresh_result(data);});
+	setSubmitDisabled(true);
-  	$("#Submit").prop('disabled', true);
+	submitSolutionAjax(true);
-  	$("#TestRun").prop('disabled', true);
 	problem_id.value=-problem_id.value;
-	count=<?php echo isset($OJ_SUBMIT_COOLDOWN_TIME)?$OJ_SUBMIT_COOLDOWN_TIME:5  ?> * 2 ;
-	handler_interval= window.setTimeout("resume();",1000);
 }
 function resume(){
 	count--;