diff --git a/packages/common/types.ts b/packages/common/types.ts
index a1300ff86..f57c49dc2 100644
--- a/packages/common/types.ts
+++ b/packages/common/types.ts
@@ -107,7 +107,7 @@ export interface RecordPayload extends RecordJudgeInfo {
     source?: string;
     progress?: number;
     /** pretest */
-    input?: string;
+    input?: string | string[];
     /** hack target rid */
     hackTarget?: string;
     /** 0 if pretest&script */
diff --git a/packages/hydrojudge/src/judge/generate.ts b/packages/hydrojudge/src/judge/generate.ts
index 613879cfe..9b864cdce 100644
--- a/packages/hydrojudge/src/judge/generate.ts
+++ b/packages/hydrojudge/src/judge/generate.ts
@@ -29,7 +29,7 @@ export const judge = async (ctx: JudgeTask) => {
         await using res = await runQueued(
             `${executeGenerator.execute} ${i}`,
             {
-                stdin: { content: ctx.input || '' },
+                stdin: { content: (ctx.input || [])[i - 1] || '' },
                 copyIn: executeGenerator.copyIn,
                 copyOut: ['stderr'],
                 copyOutCached: ['stdout'],
diff --git a/packages/hydrojudge/src/judge/run.ts b/packages/hydrojudge/src/judge/run.ts
index 3dc8b5e78..87b9b71d5 100644
--- a/packages/hydrojudge/src/judge/run.ts
+++ b/packages/hydrojudge/src/judge/run.ts
@@ -1,19 +1,17 @@
-import { STATUS } from '@hydrooj/common';
+import { NormalizedCase, STATUS } from '@hydrooj/common';
 import { parseMemoryMB, parseTimeMS } from '@hydrooj/utils';
+import { runFlow } from '../flow';
 import { runQueued } from '../sandbox';
 import signals from '../signals';
-import { JudgeTask } from '../task';
+import { Context } from './interface';
 
-export const judge = async (ctx: JudgeTask) => {
-    ctx.next({ status: STATUS.STATUS_COMPILING });
-    const execute = await ctx.compile(ctx.lang, ctx.code);
-    ctx.next({ status: STATUS.STATUS_JUDGING, progress: 0 });
+const judgeCase = (c: NormalizedCase) => async (ctx: Context) => {
     const { address_space_limit, process_limit } = ctx.session.getLang(ctx.lang);
     const res = await runQueued(
-        execute.execute,
+        ctx.execute.execute,
         {
-            stdin: { content: ctx.input },
-            copyIn: execute.copyIn,
+            stdin: { content: c.input },
+            copyIn: ctx.execute.copyIn,
             // Allow 2x limits for better debugging
             time: parseTimeMS(ctx.config.time || '1s') * 2,
             memory: parseMemoryMB(ctx.config.memory || '256m'),
@@ -21,7 +19,7 @@ export const judge = async (ctx: JudgeTask) => {
             addressSpaceLimit: address_space_limit,
             processLimit: process_limit,
         },
-        `judge[${ctx.rid}]`,
+        `pretest[${c.id}]<${ctx.rid}>`,
         1,
     );
     const {
@@ -39,27 +37,42 @@ export const judge = async (ctx: JudgeTask) => {
         else message.push(`ExitCode: ${code}`);
     }
     message.push(res.stdout, res.stderr);
-    ctx.next({
-        status,
-        time: Math.floor(time * 1000000) / 1000000,
-        memory,
-        score: status === STATUS.STATUS_ACCEPTED ? 100 : 0,
-        case: {
-            subtaskId: 0,
-            status,
-            score: 100,
-            time,
-            memory,
-            message: message.join('\n').substring(0, 102400),
-        },
-    });
-    if ([STATUS.STATUS_WRONG_ANSWER, STATUS.STATUS_RUNTIME_ERROR].includes(status)) {
-        await ctx.runAnalysis(execute, { content: ctx.input });
+    if (!ctx.analysis && [STATUS.STATUS_WRONG_ANSWER, STATUS.STATUS_RUNTIME_ERROR].includes(status)) {
+        ctx.analysis = true;
+        await ctx.runAnalysis(ctx.execute, { content: c.input });
     }
-    ctx.end({
+    return {
+        id: c.id,
+        subtaskId: 1,
         status,
-        time: Math.floor(time * 1000000) / 1000000,
+        score: 1,
+        time,
         memory,
-        score: status === STATUS.STATUS_ACCEPTED ? 100 : 0,
+        message: message.join('\n').substring(0, 102400),
+    };
+};
+
+export const judge = async (ctx: Context) => {
+    ctx.config.subtasks = [{
+        id: 1,
+        type: 'sum',
+        score: 100,
+        time: ctx.config.time,
+        memory: ctx.config.memory,
+        if: [],
+        cases: ctx.input.map((i, idx) => ({
+            id: idx + 1,
+            time: ctx.config.time,
+            memory: ctx.config.memory,
+            input: i,
+            output: '',
+            score: 1,
+        })),
+    }];
+    await runFlow(ctx, {
+        compile: async () => {
+            ctx.execute = await ctx.compile(ctx.lang, ctx.code);
+        },
+        judgeCase,
     });
 };
diff --git a/packages/hydrojudge/src/task.ts b/packages/hydrojudge/src/task.ts
index a77064274..aec0d46a1 100644
--- a/packages/hydrojudge/src/task.ts
+++ b/packages/hydrojudge/src/task.ts
@@ -30,7 +30,7 @@ export class JudgeTask {
     rid: string;
     lang: string;
     code: CopyInFile;
-    input?: string;
+    input?: string[];
     finished: boolean = false;
     clean: (() => Promise<any>)[] = [];
     data: FileInfo[];
@@ -67,7 +67,7 @@ export class JudgeTask {
             this.source = this.request.source;
             this.meta = this.request.meta;
             this.files = this.request.files;
-            this.input = this.request.input;
+            this.input = Array.isArray(this.request.input) ? this.request.input : [this.request.input || ''];
             let tid = this.request.contest?.toString() || '';
             if (tid === '000000000000000000000000') tid = '';
             this.env = {
diff --git a/packages/hydrooj/src/handler/manage.ts b/packages/hydrooj/src/handler/manage.ts
index 269d06277..0b5ac01fc 100644
--- a/packages/hydrooj/src/handler/manage.ts
+++ b/packages/hydrooj/src/handler/manage.ts
@@ -103,7 +103,7 @@ class SystemScriptHandler extends SystemHandler {
         if (typeof global.Hydro.script[id].validate === 'function') {
             args = global.Hydro.script[id].validate(args);
         }
-        const rid = await record.add(domainId, -1, this.user._id, '-', id, false, { input: raw, type: 'pretest' });
+        const rid = await record.add(domainId, -1, this.user._id, '-', id, false, { input: [raw], type: 'pretest' });
         const c = new JudgeResultCallbackContext(this.ctx, { type: 'judge', domainId, rid });
         c.next({ message: `Running script: ${id} `, status: STATUS.STATUS_JUDGING });
         const start = Date.now();
diff --git a/packages/hydrooj/src/handler/problem.ts b/packages/hydrooj/src/handler/problem.ts
index e2fa80edf..dc3fa7a2a 100644
--- a/packages/hydrooj/src/handler/problem.ts
+++ b/packages/hydrooj/src/handler/problem.ts
@@ -483,9 +483,9 @@ export class ProblemSubmitHandler extends ProblemDetailHandler {
     @param('lang', Types.Name)
     @param('code', Types.String, true)
     @param('pretest', Types.Boolean)
-    @param('input', Types.String, true)
+    @param('input', Types.ArrayOf(Types.String), true)
     @param('tid', Types.ObjectId, true)
-    async post(domainId: string, lang: string, code: string, pretest = false, input = '', tid?: ObjectId) {
+    async post(domainId: string, lang: string, code: string, pretest = false, input: string[] = [], tid?: ObjectId) {
         const config = this.pdoc.config;
         if (typeof config === 'string' || config === null) throw new ProblemConfigError();
         if (['submit_answer', 'objective'].includes(config.type)) {
@@ -498,6 +498,7 @@ export class ProblemSubmitHandler extends ProblemDetailHandler {
             if (!['default', 'remote_judge'].includes(this.response.body.pdoc.config?.type)) {
                 throw new ProblemNotAllowPretestError('type');
             }
+            if (!input.length) throw new ValidationError('input');
         }
         await this.limitRate('add_record', 60, system.get('limit.submission_user'), '{{user}}');
         await this.limitRate('add_record', 60, pretest ? system.get('limit.pretest') : system.get('limit.submission'));
diff --git a/packages/hydrooj/src/model/record.ts b/packages/hydrooj/src/model/record.ts
index 5386525e4..7024f1340 100644
--- a/packages/hydrooj/src/model/record.ts
+++ b/packages/hydrooj/src/model/record.ts
@@ -131,7 +131,7 @@ export default class RecordModel {
         lang: string, code: string, addTask: boolean,
         args: {
             contest?: ObjectId;
-            input?: string;
+            input?: string[];
             files?: Record<string, string>;
             hackTarget?: ObjectId;
             type: 'judge' | 'rejudge' | 'pretest' | 'hack' | 'generate';
@@ -165,7 +165,7 @@ export default class RecordModel {
             args.type = 'judge';
             data.rejudged = true;
         } else if (args.type === 'pretest') {
-            data.input = args.input || '';
+            data.input = args.input || [];
             isContest = false;
             data.contest = RecordModel.RECORD_PRETEST;
         } else if (args.type === 'generate') {
diff --git a/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx b/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx
index e722a2bb9..6316b5ab4 100644
--- a/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx
+++ b/packages/ui-default/components/scratchpad/ScratchpadToolbarContainer.jsx
@@ -39,7 +39,7 @@ const mapDispatchToProps = (dispatch) => ({
     const req = request.post(UiContext.postSubmitUrl, {
       lang: props.editorLang,
       code: props.editorCode,
-      input: props.pretestInput,
+      input: [props.pretestInput],
       pretest: true,
     });
     dispatch({