diff --git a/packages/hydrooj/package.json b/packages/hydrooj/package.json
index d88a01a8f..b52a5dea5 100644
--- a/packages/hydrooj/package.json
+++ b/packages/hydrooj/package.json
@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "4.9.2",
+    "version": "4.9.3",
     "bin": "bin/hydrooj.js",
     "main": "src/plugin-api",
     "module": "src/plugin-api",
diff --git a/packages/ui-default/components/problemconfig/SubtaskTable.tsx b/packages/ui-default/components/problemconfig/SubtaskTable.tsx
deleted file mode 100644
index 1a7d49d39..000000000
--- a/packages/ui-default/components/problemconfig/SubtaskTable.tsx
+++ /dev/null
@@ -1,186 +0,0 @@
-import { Card, NumericInput, Tag } from '@blueprintjs/core';
-import { parseMemoryMB, parseTimeMS } from '@hydrooj/utils/lib/common';
-import type { SubtaskConfig } from 'hydrooj/src/interface';
-import { isEqual, pick } from 'lodash';
-import React from 'react';
-import { useDispatch, useSelector } from 'react-redux';
-import { i18n } from 'vj/utils';
-import CustomSelectAutoComplete from '../autocomplete/components/CustomSelectAutoComplete';
-import { FormItem } from './BasicForm';
-import { RootState } from './reducer';
-import { CasesTable } from './TestCasesTable';
-
-const eq = (a: SubtaskConfig, b: SubtaskConfig) => isEqual(a, b);
-
-export function SubtasksIds({ index }) {
-  const ids = useSelector((state: RootState) => state.config.subtasks.map((i) => (i ? i.id : undefined)).filter((i) => i !== undefined).join(','));
-  const subtaskIf = useSelector((state: RootState) => state.config.subtasks[index].if);
-  const dispatch = useDispatch();
-  return (
-    <tr>
-      <td style={{ textAlign: 'center' }}>if</td>
-      <td colSpan={4}>
-        <CustomSelectAutoComplete
-          data={ids.split(',').filter((i) => i.length)}
-          selectedKeys={subtaskIf?.map(String) || []}
-          onChange={(val) => dispatch({
-            type: 'CONFIG_SUBTASK_UPDATE', id: index, key: 'if', value: val.split(','),
-          })}
-          multi
-        />
-      </td>
-    </tr>
-  );
-}
-
-export function SubtasksTable({ index }) {
-  const keys = ['id', 'type', 'score', 'time', 'memory'];
-  const subtask = useSelector((state: RootState) => pick(state.config.subtasks[index], keys), eq);
-  const defaultTime = useSelector((state: RootState) => state.config.time);
-  const defaultMemory = useSelector((state: RootState) => state.config.memory);
-  const dispatch = useDispatch();
-  const dispatcher = (key: string, suffix = '') => (ev: React.ChangeEvent<HTMLInputElement | HTMLSelectElement> | number) => {
-    let value = typeof ev !== 'object' ? ev : ev.currentTarget?.value;
-    if (value === 0) value = '';
-    if (value && suffix) value += suffix;
-    dispatch({
-      type: 'CONFIG_SUBTASK_UPDATE', id: index, key, value,
-    });
-  };
-  if (!subtask || Object.keys(subtask).length === 0) {
-    return (
-      <Card style={{ padding: 0 }}>
-        <span>Subtasks #{index + 1} </span>
-        <p>{i18n('Failed to parse subtask.')}</p>
-      </Card>
-    );
-  }
-  return (
-    <Card style={{ padding: 0 }}>
-      <span>Subtasks #{index + 1} </span>
-      <a onClick={() => dispatch({ type: 'CONFIG_SUBTASK_UPDATE', id: index, key: 'add' })}><span className="icon icon-add"></span></a>
-      <a
-        style={index === 0 ? { display: 'none' } : {}}
-        onClick={() => dispatch({ type: 'CONFIG_SUBTASK_UPDATE', id: index, key: 'delete' })}
-      >
-        <span className="icon icon-delete"></span>
-      </a>
-      <table className="data-table">
-        <thead>
-          <tr>
-            <th>#</th>
-            <th>Score</th>
-            <th>Type</th>
-            <th>Time</th>
-            <th>Memory</th>
-          </tr>
-        </thead>
-        <tbody>
-          <tr>
-            {['id', 'score'].map((key) => (
-              <td key={key}>
-                <input
-                  value={subtask[key] ?? ''}
-                  onChange={dispatcher(key)}
-                  type="number"
-                  className="textbox"
-                />
-              </td>
-            ))}
-            <td>
-              <select
-                value={subtask.type ?? 'min'}
-                onChange={dispatcher('type')}
-                className="select"
-              >
-                {['min', 'max', 'sum'].map((i) => (<option value={i} key={i}>{i}</option>))}
-              </select>
-            </td>
-            <td>
-              <NumericInput
-                rightElement={<Tag minimal>ms</Tag>}
-                value={subtask.time ? parseTimeMS(subtask.time, false).toString() : ''}
-                placeholder={parseTimeMS(defaultTime || '1000ms', false).toString()}
-                onValueChange={dispatcher('time', 'ms')}
-                buttonPosition="none"
-                fill
-              />
-            </td>
-            <td>
-              <NumericInput
-                rightElement={<Tag minimal>MB</Tag>}
-                value={subtask.memory ? parseMemoryMB(subtask.memory, false).toString() : ''}
-                placeholder={parseMemoryMB(defaultMemory || '256m', false).toString()}
-                onValueChange={dispatcher('memory', 'MB')}
-                buttonPosition="none"
-                fill
-              />
-            </td>
-          </tr>
-          <SubtasksIds index={index} />
-        </tbody>
-      </table>
-      <CasesTable index={index} />
-    </Card>
-  );
-}
-
-function GlobalTaskConfig() {
-  const time = useSelector((state: RootState) => state.config.time);
-  const memory = useSelector((state: RootState) => state.config.memory);
-  const dispatch = useDispatch();
-  const dispatcher = (key: string, suffix = '') => (ev: React.ChangeEvent<HTMLInputElement | HTMLSelectElement> | number) => {
-    let value = typeof ev !== 'object' ? ev : ev.currentTarget?.value;
-    if (value === 0) value = '';
-    if (value && suffix) value += suffix;
-    dispatch({ type: 'CONFIG_FORM_UPDATE', key, value });
-  };
-  return (
-    <>
-      <FormItem columns={6} label="Time">
-        <NumericInput
-          rightElement={<Tag minimal>ms</Tag>}
-          value={time ? parseTimeMS(time, false).toString() : ''}
-          placeholder={parseTimeMS('1000ms').toString()}
-          onValueChange={dispatcher('time', 'ms')}
-          buttonPosition="none"
-          fill
-        />
-      </FormItem>
-      <FormItem columns={6} label="Memory">
-        <NumericInput
-          rightElement={<Tag minimal>MB</Tag>}
-          value={memory ? parseMemoryMB(memory, false).toString() : ''}
-          placeholder={parseMemoryMB('256m').toString()}
-          onValueChange={dispatcher('memory', 'MB')}
-          buttonPosition="none"
-          fill
-        />
-      </FormItem>
-    </>
-  );
-}
-
-export function TaskConfig() {
-  const len = useSelector((state: RootState) => state.config.subtasks?.length);
-  const dispatch = useDispatch();
-  return (
-    <FormItem columns={12} label="Task Settings">
-      <div className="row">
-        <GlobalTaskConfig />
-        <FormItem columns={12} label="TestCases" disableLabel>
-          {len > 0
-            ? [...Array(len).keys()].map((i) => <SubtasksTable index={i} key={i} />)
-            : (
-              <>
-                <span>Subtasks # </span>
-                <a onClick={() => dispatch({ type: 'CONFIG_SUBTASK_UPDATE', id: 0, key: 'add' })}>
-                  <span className="icon icon-add"></span>
-                </a>
-              </>
-            )}
-        </FormItem>
-      </div>
-    </FormItem>
-  );
-}
diff --git a/packages/ui-default/components/problemconfig/TestCasesTable.tsx b/packages/ui-default/components/problemconfig/TestCasesTable.tsx
deleted file mode 100644
index 253ad6a7c..000000000
--- a/packages/ui-default/components/problemconfig/TestCasesTable.tsx
+++ /dev/null
@@ -1,162 +0,0 @@
-import { NumericInput, Tag } from '@blueprintjs/core';
-import { parseMemoryMB, parseTimeMS } from '@hydrooj/utils/lib/common';
-import type { SubtaskConfig } from 'hydrooj/src/interface';
-import { isEqual } from 'lodash';
-import React, { useEffect, useRef } from 'react';
-import { useDispatch, useSelector } from 'react-redux';
-import { i18n } from 'vj/utils';
-import FileSelectAutoComplete from '../autocomplete/components/FileSelectAutoComplete';
-import type { RootState } from './reducer/index';
-
-const eq = (a: SubtaskConfig, b: SubtaskConfig) => isEqual(a, b);
-const eqArr = (a: any[], b: any[]) => isEqual(a, b);
-
-export function TestCaseEntry({ index, subindex }) {
-  const testcase = useSelector((state: RootState) => state.config.subtasks[index].cases[subindex], eq);
-  const Files = useSelector((state: RootState) => state.testdata, eqArr);
-  const defaultTime = useSelector((state: RootState) => state.config.subtasks[index].time || state.config.time);
-  const defaultMemory = useSelector((state: RootState) => state.config.subtasks[index].memory || state.config.memory);
-  const dispatch = useDispatch();
-  const dispatcher = (casesKey: string, valueSuffix = '') => (ev: React.ChangeEvent<HTMLInputElement | HTMLSelectElement> | number) => {
-    let value = typeof ev !== 'object' ? ev : ev.currentTarget.value;
-    if (value === 0) value = '';
-    if (valueSuffix && value) value += valueSuffix;
-    dispatch({
-      type: 'CONFIG_SUBTASK_UPDATE',
-      id: index,
-      key: 'cases-edit',
-      casesId: subindex,
-      casesKey,
-      value,
-    });
-    if ((casesKey === 'input' && (value as string).endsWith('.in') && !testcase.output)
-      || (casesKey === 'output' && (value as string).endsWith('.out') && !testcase.input)) {
-      const filename = (value as string).substring(0, (value as string).lastIndexOf('.'));
-      if (!testcase.output && (Files.map((f) => f.name).includes(`${filename}.out`) || Files.map((f) => f.name).includes(`${filename}.ans`))) {
-        dispatch({
-          type: 'CONFIG_SUBTASK_UPDATE',
-          id: index,
-          key: 'cases-edit',
-          casesId: subindex,
-          casesKey: 'output',
-          value: Files.map((f) => f.name).includes(`${filename}.out`) ? `${filename}.out` : `${filename}.ans`,
-        });
-      }
-      if (!testcase.input && Files.map((f) => f.name).includes(`${filename}.in`)) {
-        dispatch({
-          type: 'CONFIG_SUBTASK_UPDATE',
-          id: index,
-          key: 'cases-edit',
-          casesId: subindex,
-          casesKey: 'input',
-          value: `${filename}.in`,
-        });
-      }
-    }
-  };
-  const refs = {
-    input: useRef(),
-    output: useRef(),
-  };
-  for (const type of ['input', 'output']) {
-    useEffect(() => { // eslint-disable-line
-      refs[type].current?.setSelectedItems(testcase[type] ? [testcase[type]] : []);
-    }, [testcase[type]]);
-  }
-  if (!testcase || Object.keys(testcase).length === 0) {
-    return (
-      <tr><td colSpan={5}>{i18n('Failed to parse testcase.')}</td></tr>
-    );
-  }
-  return (
-    <tr>
-      <td>
-        <NumericInput
-          rightElement={<Tag minimal>ms</Tag>}
-          value={testcase.time ? parseTimeMS(testcase.time, false).toString() : ''}
-          placeholder={parseTimeMS(defaultTime || '1000ms', false).toString()}
-          onValueChange={dispatcher('time', 'ms')}
-          buttonPosition="none"
-          fill
-        />
-      </td>
-      <td>
-        <NumericInput
-          rightElement={<Tag minimal>MB</Tag>}
-          value={testcase.memory ? parseMemoryMB(testcase.memory, false).toString() : ''}
-          placeholder={parseMemoryMB(defaultMemory || '256m', false).toString()}
-          onValueChange={dispatcher('memory', 'MB')}
-          buttonPosition="none"
-          fill
-        />
-      </td>
-      {['input', 'output'].map((t) => (
-        <td key={t}>
-          <FileSelectAutoComplete
-            ref={refs[t]}
-            width="100%"
-            data={Files}
-            selectedKeys={[testcase[t]]}
-            onChange={dispatcher(t)}
-          />
-        </td>
-      ))}
-      <td className="col--operation">
-        <a
-          onClick={() => dispatch({
-            type: 'CONFIG_SUBTASK_UPDATE', id: index, key: 'cases-delete', value: subindex,
-          })}
-        ><span className="icon icon-close"></span>
-        </a>
-      </td>
-    </tr>
-  );
-}
-
-export function CasesTable({ index }) {
-  const len = useSelector((state: RootState) => state.config.subtasks[index].cases?.length);
-  const dispatch = useDispatch();
-  return (
-    <table className="data-table">
-      <thead style={{ display: 'none' }}>
-        <tr>
-          <th>{i18n('Time')}</th>
-          <th>{i18n('Memory')}</th>
-          <th>{i18n('Input')}</th>
-          <th>{i18n('Output')}</th>
-          <th className="col--operation">
-            <a
-              onClick={() => dispatch({
-                type: 'CONFIG_SUBTASK_UPDATE',
-                id: index,
-                key: 'cases-add',
-                value: { input: '', output: '' },
-              })}
-            ><span className="icon icon-add" />
-            </a>
-          </th>
-        </tr>
-      </thead>
-      <tbody>
-        <tr className="thead">
-          <td>{i18n('Time')}</td>
-          <td>{i18n('Memory')}</td>
-          <td>{i18n('Input')}</td>
-          <td>{i18n('Output')}</td>
-          <td className="col--operation">
-            <a
-              onClick={() => dispatch({
-                type: 'CONFIG_SUBTASK_UPDATE',
-                id: index,
-                key: 'cases-add',
-                value: { input: '', output: '' },
-              })}
-            ><span className="icon icon-add" />
-            </a>
-          </td>
-        </tr>
-        {len > 0 && [...Array(len).keys()].map((i) => <TestCaseEntry index={index} subindex={i} key={i} />)}
-      </tbody>
-    </table>
-  );
-}
diff --git a/packages/ui-default/components/problemconfig/tree/SubtaskSettings.tsx b/packages/ui-default/components/problemconfig/tree/SubtaskSettings.tsx
index f5781a9ae..8caf21aa1 100644
--- a/packages/ui-default/components/problemconfig/tree/SubtaskSettings.tsx
+++ b/packages/ui-default/components/problemconfig/tree/SubtaskSettings.tsx
@@ -64,15 +64,15 @@ export function SubtaskSettings(props: SubtaskSettingsProps) {
           <InputGroup
             leftElement={<Icon icon="time" />}
             rightElement={<Tag minimal>ms</Tag>}
-            onChange={(ev) => setTime(`${ev.currentTarget.value}ms`)}
-            placeholder={`Inherit (${parseTimeMS(props.time, false) || '1000'})`}
+            onChange={(ev) => setTime(ev.currentTarget.value ? `${ev.currentTarget.value}ms` : '')}
+            placeholder={parseTimeMS(props.time, false).toString() || '1000'}
             value={ctime ? parseTimeMS(ctime, false).toString() || '' : ''}
           />
           <InputGroup
             leftElement={<Icon icon="comparison" />}
             rightElement={<Tag minimal>MB</Tag>}
-            onChange={(ev) => setMemory(`${ev.currentTarget.value}MB`)}
-            placeholder={`Inherit (${parseMemoryMB(props.memory, false) || '256'})`}
+            onChange={(ev) => setMemory(ev.currentTarget.value ? `${ev.currentTarget.value}MB` : '')}
+            placeholder={parseMemoryMB(props.memory, false).toString() || '256'}
             value={cmemory ? parseMemoryMB(cmemory, false).toString() || '' : ''}
           />
           <InputGroup
@@ -167,14 +167,14 @@ export function GlobalSettings() {
           <InputGroup
             leftElement={<Icon icon="time" />}
             rightElement={<Tag minimal>ms</Tag>}
-            onChange={(ev) => setTime(`${ev.currentTarget.value}ms`)}
+            onChange={(ev) => setTime(ev.currentTarget.value ? `${ev.currentTarget.value}ms` : '')}
             placeholder="1000"
             value={ctime ? parseTimeMS(ctime, false).toString() || '' : ''}
           />
           <InputGroup
             leftElement={<Icon icon="comparison" />}
             rightElement={<Tag minimal>MB</Tag>}
-            onChange={(ev) => setMemory(`${ev.currentTarget.value}MB`)}
+            onChange={(ev) => setMemory(ev.currentTarget.value ? `${ev.currentTarget.value}MB` : '')}
             placeholder="256"
             value={cmemory ? parseMemoryMB(cmemory, false).toString() || '' : ''}
           />
diff --git a/packages/ui-default/package.json b/packages/ui-default/package.json
index 6131d5870..8b3e44f1b 100644
--- a/packages/ui-default/package.json
+++ b/packages/ui-default/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.48.4",
+  "version": "4.48.5",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "index.ts",