core: remove useless difficulty calculation

packages/hydrooj/src/handler/judge.ts

@@ -1,6 +1,5 @@
 import { ObjectID } from 'mongodb';
 import { JudgeResultBody, RecordDoc, TestCase } from '../interface';
-import difficultyAlgorithm from '../lib/difficulty';
 import { Logger } from '../logger';
 import * as builtin from '../model/builtin';
 import * as contest from '../model/contest';
@@ -34,9 +33,7 @@ export async function postJudge(rdoc: RecordDoc) {
         ? await problem.inc(rdoc.domainId, rdoc.pid, 'nAccept', 1)
         : await problem.get(rdoc.domainId, rdoc.pid);
     if (pdoc) {
-        const difficulty = difficultyAlgorithm(pdoc.nSubmit, pdoc.nAccept);
         await Promise.all([
-            problem.edit(pdoc.domainId, pdoc.docId, { difficulty }),
             problem.inc(pdoc.domainId, pdoc.docId, `stats.${builtin.STATUS_SHORT_TEXTS[rdoc.status]}`, 1),
             problem.inc(pdoc.domainId, pdoc.docId, `stats.s${rdoc.score}`, 1),
         ]);

packages/hydrooj/src/handler/problem.ts

@@ -14,7 +14,6 @@ import {
     ProblemConfig,
     ProblemDoc, ProblemStatusDoc, Tdoc, User,
 } from '../interface';
-import difficultyAlgorithm from '../lib/difficulty';
 import paginate from '../lib/paginate';
 import { isPid, parsePid as convertPid } from '../lib/validator';
 import { PERM, PRIV } from '../model/builtin';

packages/hydrooj/src/model/problem.ts

@@ -8,7 +8,6 @@ import { ProblemNotFoundError, ValidationError } from '../error';
 import type {
     Document, ProblemDict, ProblemStatusDoc,
 } from '../interface';
-import difficultyAlgorithm from '../lib/difficulty';
 import { parseConfig } from '../lib/testdataConfig';
 import * as bus from '../service/bus';
 import {

packages/hydrooj/src/upgrade.ts

@@ -9,7 +9,6 @@ import { GridFSBucket, ObjectID } from 'mongodb';
 import Queue from 'p-queue';
 import { convertIniConfig } from '@hydrooj/utils/lib/cases';
 import { buildContent } from './lib/content';
-import difficultyAlgorithm from './lib/difficulty';
 import { size } from './lib/misc';
 import { Logger } from './logger';
 import { PRIV, STATUS } from './model/builtin';
@@ -199,11 +198,6 @@ const scripts: UpgradeScript[] = [
     },
     // Update problem difficulty
     async function _12_13() {
-        const _FRESH_INSTALL_IGNORE = 1;
-        await iterateAllProblem(['nSubmit', 'nAccept'], async (pdoc) => {
-            const difficulty = difficultyAlgorithm(pdoc.nSubmit, pdoc.nAccept);
-            await problem.edit(pdoc.domainId, pdoc.docId, { difficulty });
-        });
         return true;
     },
     // Set domain owner perm