diff --git a/packages/hydrojudge/package.json b/packages/hydrojudge/package.json
index 17102c9bb..d5a8c9bbd 100644
--- a/packages/hydrojudge/package.json
+++ b/packages/hydrojudge/package.json
@@ -1,7 +1,7 @@
 {
     "name": "@hydrooj/hydrojudge",
     "bin": "bin/hydrojudge.js",
-    "version": "2.3.5",
+    "version": "2.3.6",
     "main": "package.json",
     "author": "undefined <i@undefined.moe>",
     "repository": "https://github.com/hydro-dev/Hydro.git",
diff --git a/packages/hydrojudge/src/hosts/hydro.ts b/packages/hydrojudge/src/hosts/hydro.ts
index a88bdbb42..041afdf87 100644
--- a/packages/hydrojudge/src/hosts/hydro.ts
+++ b/packages/hydrojudge/src/hosts/hydro.ts
@@ -29,6 +29,7 @@ class JudgeTask {
     lang: string;
     code: string;
     tmpdir: string;
+    input?: string;
     clean: Function[];
     data: any[];
     folder: string;
@@ -57,6 +58,7 @@ class JudgeTask {
         this.lang = this.request.lang;
         this.code = this.request.code;
         this.config = this.request.config;
+        this.input = this.request.input;
         this.data = this.request.data;
         this.tmpdir = path.resolve(getConfig('tmp_dir'), this.host, this.rid);
         this.clean = [];
@@ -64,9 +66,8 @@ class JudgeTask {
         tmpfs.mount(this.tmpdir, '512m');
         log.info('Submission: %s/%s/%s pid=%s', this.host, this.domainId, this.rid, this.pid);
         try {
-            if (this.type === 'judge') await this.doSubmission();
-            else if (this.type === 1) await this.doPretest();
-            else throw new SystemError(`Unsupported type: ${this.type}`);
+            if (this.input) await this.doPretest();
+            else await this.doSubmission();
         } catch (e) {
             if (e instanceof CompileError) {
                 this.next({ compiler_text: compilerText(e.stdout, e.stderr) });
diff --git a/packages/hydrojudge/src/judge/run.ts b/packages/hydrojudge/src/judge/run.ts
index 8cc478334..e54c79d0b 100644
--- a/packages/hydrojudge/src/judge/run.ts
+++ b/packages/hydrojudge/src/judge/run.ts
@@ -55,10 +55,10 @@ export const judge = async (ctx) => {
     ctx.next({ status: STATUS.STATUS_JUDGING, progress: 0 });
     const copyIn = { ...ctx.execute.copyIn };
     const { filename } = ctx.config;
-    if (filename) copyIn[`${filename}.in`] = { content: ctx.config.input };
+    if (filename) copyIn[`${filename}.in`] = { content: ctx.input };
     const copyOut = filename ? [`${filename}.out`] : [];
     const stdin = path.resolve(ctx.tmpdir, '0.in');
-    await fs.writeFile(stdin, ctx.config.input || '');
+    await fs.writeFile(stdin, ctx.input || '');
     const stdout = path.resolve(ctx.tmpdir, '0.out');
     const stderr = path.resolve(ctx.tmpdir, '0.err');
     const res = await run(
diff --git a/packages/hydrojudge/src/service.ts b/packages/hydrojudge/src/service.ts
index ff4ddcacc..08d79452b 100644
--- a/packages/hydrojudge/src/service.ts
+++ b/packages/hydrojudge/src/service.ts
@@ -155,6 +155,7 @@ async function postInit() {
         code: string;
         data: any[];
         config: any;
+        input?: string;
         next: (data: any, id?: number) => void;
         end: (data: any) => void;
         tmpdir: string;
@@ -178,6 +179,7 @@ async function postInit() {
                 this.code = this.request.code;
                 this.data = this.request.data;
                 this.config = this.request.config;
+                this.input = this.request.input;
                 this.next = getNext(this);
                 this.end = getEnd(this.domainId, this.rid);
                 this.tmpdir = path.resolve(getConfig('tmp_dir'), this.rid);
@@ -185,8 +187,7 @@ async function postInit() {
                 fs.ensureDirSync(this.tmpdir);
                 tmpfs.mount(this.tmpdir, getConfig('tmpfs_size'));
                 logger.info(`Submission: ${this.rid}`, { pid: this.pid });
-                if (this.config.input) await this.run();
-                else if (this.config.hack) await this.hack();
+                if (typeof this.input === 'string') await this.run();
                 else await this.submission();
             } catch (e) {
                 if (e instanceof CompileError) {
@@ -226,19 +227,6 @@ async function postInit() {
             await judge[this.config.type || 'default'].judge(this);
         }
 
-        async hack() {
-            this.stat.cache_start = new Date();
-            this.folder = await cacheOpen(this.domainId, this.pid, this.data);
-            this.stat.read_cases = new Date();
-            this.config = await readYamlCases(
-                this.folder,
-                this.config,
-                { next: this.next },
-            );
-            this.stat.judge = new Date();
-            await judge.hack.judge(this);
-        }
-
         async run() {
             this.stat.judge = new Date();
             await judge.run.judge(this);
diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index 969b94d19..c62e036f8 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.17.11",
+    "version": "2.17.12",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",
diff --git a/packages/hydrooj/src/handler/judge.ts b/packages/hydrooj/src/handler/judge.ts
index bbd3a4501..5356cab7b 100644
--- a/packages/hydrooj/src/handler/judge.ts
+++ b/packages/hydrooj/src/handler/judge.ts
@@ -16,6 +16,7 @@ import {
 const logger = new Logger('judge');
 
 async function _postJudge(rdoc: Rdoc) {
+    if (typeof rdoc.input === 'string') return;
     const accept = rdoc.status === builtin.STATUS.STATUS_ACCEPTED;
     const tasks = [];
     if (rdoc.contest) {
diff --git a/packages/hydrooj/src/interface.ts b/packages/hydrooj/src/interface.ts
index eacfff316..c2e16204e 100644
--- a/packages/hydrooj/src/interface.ts
+++ b/packages/hydrooj/src/interface.ts
@@ -226,18 +226,6 @@ export interface TestCase {
     message: string,
 }
 
-export interface HackConfig {
-    hack: string,
-}
-
-export interface PretestConfig {
-    time?: string,
-    memory?: string,
-    input: string,
-}
-
-export type RunConfig = HackConfig | PretestConfig;
-
 export interface ContestInfo {
     type: 30 | 60,
     tid: ObjectID,
@@ -262,7 +250,7 @@ export interface Rdoc {
     status: number,
     hidden: boolean,
     progress?: number,
-    config?: RunConfig,
+    input?: string,
     contest?: ContestInfo,
 }
 
diff --git a/packages/hydrooj/src/model/record.ts b/packages/hydrooj/src/model/record.ts
index 9094c594e..d7151e59e 100644
--- a/packages/hydrooj/src/model/record.ts
+++ b/packages/hydrooj/src/model/record.ts
@@ -7,7 +7,7 @@ import { STATUS } from './builtin';
 import * as task from './task';
 import * as problem from './problem';
 import {
-    Rdoc, TestCase, RunConfig, ContestInfo, ProblemConfig,
+    Rdoc, TestCase, ContestInfo, ProblemConfig,
 } from '../interface';
 import { Time } from '../utils';
 import * as bus from '../service/bus';
@@ -94,7 +94,7 @@ export async function judge(domainId: string, rid: ObjectID, priority = 1) {
 
 export async function add(
     domainId: string, pid: number, uid: number,
-    lang: string, code: string, addTask: boolean, contestOrConfig?: ContestInfo | RunConfig,
+    lang: string, code: string, addTask: boolean, contestOrConfig?: ContestInfo | string,
 ) {
     const data: Rdoc = {
         status: STATUS.STATUS_WAITING,
@@ -115,14 +115,11 @@ export async function add(
         judgeAt: null,
         rejudged: false,
     };
-    if (contestOrConfig) {
-        if ((contestOrConfig as ContestInfo).type) {
-            data.contest = contestOrConfig as ContestInfo;
-        } else {
-            data.config = contestOrConfig as RunConfig;
-            data.hidden = true;
-        }
-    }
+    if (typeof contestOrConfig === 'string') {
+        // is Run
+        data.input = contestOrConfig;
+        data.hidden = true;
+    } else data.contest = contestOrConfig;
     const res = await coll.insertOne(data);
     if (addTask) await judge(domainId, res.insertedId);
     return res.insertedId;