diff --git a/packages/better-search/package.json b/packages/better-search/package.json
index 13b3e9acd..c1860f629 100644
--- a/packages/better-search/package.json
+++ b/packages/better-search/package.json
@@ -7,7 +7,7 @@
     "author": "undefined <masnn0@outlook.com>",
     "license": "AGPL-3.0-only",
     "dependencies": {
-        "nodejieba": "^2.4.2"
+        "nodejieba": "^2.5.1"
     },
     "devDependencies": {},
     "peerDependencies": {
diff --git a/packages/hydrojudge/src/cases.ts b/packages/hydrojudge/src/cases.ts
index bf7e5964c..8dc1d6f30 100644
--- a/packages/hydrojudge/src/cases.ts
+++ b/packages/hydrojudge/src/cases.ts
@@ -1,7 +1,7 @@
 import fs from 'fs-extra';
 import path from 'path';
 import yaml from 'js-yaml';
-import { Dictionary } from 'lodash';
+import { Dictionary, sum } from 'lodash';
 import { argv } from 'yargs';
 import { FormatError, SystemError } from './error';
 import { parseTimeMS, parseMemoryMB, ensureFile } from './utils';
@@ -285,11 +285,10 @@ function convertIniConfig(ini: string) {
 }
 
 function isValidConfig(config) {
-    if (config.count > (argv.max_testcases_count as string || 100)) throw new FormatError('Too many testcases. Cancelled.');
-    let total_time = 0;
-    for (const subtask of config.subtasks) {
-        total_time += subtask.time_limit_ms * subtask.cases.length;
+    if (config.count > (argv.max_testcases_count as string || 100)) {
+        throw new FormatError('Too many testcases. Cancelled.');
     }
+    const total_time = sum(config.subtasks.map((subtask) => subtask.time_limit_ms * subtask.cases.length));
     if (total_time > (+argv.max_time_limit || 60) * 1000) {
         throw new FormatError('Total time limit longer than {0}s. Cancelled.', [+argv.max_time_limit || 60]);
     }
diff --git a/packages/hydrooj/src/model/contest.ts b/packages/hydrooj/src/model/contest.ts
index 264d310e2..96cff87a1 100644
--- a/packages/hydrooj/src/model/contest.ts
+++ b/packages/hydrooj/src/model/contest.ts
@@ -1,5 +1,4 @@
 import { ObjectID, FilterQuery } from 'mongodb';
-import { filter, sortBy } from 'lodash';
 import * as user from './user';
 import * as problem from './problem';
 import * as document from './document';