diff --git a/src/parsers/contest/HydroContestParser.ts b/src/parsers/contest/HydroContestParser.ts
index 62859e2..37f5895 100644
--- a/src/parsers/contest/HydroContestParser.ts
+++ b/src/parsers/contest/HydroContestParser.ts
@@ -5,13 +5,9 @@ export class HydroContestParser extends SimpleContestParser {
   protected linkSelector = '.col--problem.col--problem-name > a';
   protected problemParser = new HydroProblemParser();
 
-  public getMatchPatterns(): string[] {
-    const patterns = [];
-
-    for (const domain of ['hydro.ac', 'oiclass.com']) {
-      patterns.push(`https://${domain}/contest/*`);
-    }
+  protected domain = 'hydro.ac';
 
-    return patterns;
+  public getMatchPatterns(): string[] {
+    return [`https://${this.domain}/contest/*`];
   }
 }
diff --git a/src/parsers/contest/OIClassContestParser.ts b/src/parsers/contest/OIClassContestParser.ts
new file mode 100644
index 0000000..460c28f
--- /dev/null
+++ b/src/parsers/contest/OIClassContestParser.ts
@@ -0,0 +1,8 @@
+import { OIClassProblemParser } from '../problem/OIClassProblemParser';
+import { HydroContestParser } from './HydroContestParser';
+
+export class OIClassContestParser extends HydroContestParser {
+  protected problemParser = new OIClassProblemParser();
+
+  protected domain = 'oiclass.com';
+}
diff --git a/src/parsers/parsers.ts b/src/parsers/parsers.ts
index b671e8a..e1f0d70 100644
--- a/src/parsers/parsers.ts
+++ b/src/parsers/parsers.ts
@@ -29,6 +29,7 @@ import { LanqiaoContestParser } from './contest/LanqiaoContestParser';
 import { LibreOJContestParser } from './contest/LibreOJContestParser';
 import { LuoguContestParser } from './contest/LuoguContestParser';
 import { NOJContestParser } from './contest/NOJContestParser';
+import { OIClassContestParser } from './contest/OIClassContestParser';
 import { OpenJudgeContestParser } from './contest/OpenJudgeContestParser';
 import { PEGJudgeContestParser } from './contest/PEGJudgeContestParser';
 import { POJContestParser } from './contest/POJContestParser';
@@ -104,6 +105,7 @@ import { NepsAcademyProblemParser } from './problem/NepsAcademyProblemParser';
 import { NewtonSchoolProblemParser } from './problem/NewtonSchoolProblemParser';
 import { NOJProblemParser } from './problem/NOJProblemParser';
 import { NowCoderProblemParser } from './problem/NowCoderProblemParser';
+import { OIClassProblemParser } from './problem/OIClassProblemParser';
 import { OmegaUpProblemParser } from './problem/OmegaUpProblemParser';
 import { OpenJudgeProblemParser } from './problem/OpenJudgeProblemParser';
 import { OTOGProblemParser } from './problem/OTOGProblemParser';
@@ -285,6 +287,9 @@ export const parsers: Parser[] = [
 
   new NowCoderProblemParser(),
 
+  new OIClassProblemParser(),
+  new OIClassContestParser(),
+
   new OmegaUpProblemParser(),
 
   new OpenJudgeProblemParser(),
diff --git a/src/parsers/problem/HydroProblemParser.ts b/src/parsers/problem/HydroProblemParser.ts
index d694499..f1ecc02 100644
--- a/src/parsers/problem/HydroProblemParser.ts
+++ b/src/parsers/problem/HydroProblemParser.ts
@@ -4,21 +4,16 @@ import { htmlToElement } from '../../utils/dom';
 import { Parser } from '../Parser';
 
 export class HydroProblemParser extends Parser {
-  public getMatchPatterns(): string[] {
-    const patterns = [];
-
-    for (const domain of ['hydro.ac', 'oiclass.com']) {
-      for (const path of ['p/*', 'd/*/p/*', 'contest/*/p/*']) {
-        patterns.push(`https://${domain}/${path}`);
-      }
-    }
+  protected domain = 'hydro.ac';
+  protected judge = 'Hydro';
 
-    return patterns;
+  public getMatchPatterns(): string[] {
+    return [`https://${this.domain}/p/*`, `https://${this.domain}/d/*/p/*`, `https://${this.domain}/contest/*/p/*`];
   }
 
   public async parse(url: string, html: string): Promise<Sendable> {
     const elem = htmlToElement(html);
-    const task = new TaskBuilder('Hydro').setUrl(url);
+    const task = new TaskBuilder(this.judge).setUrl(url);
 
     task.setName(elem.querySelector('.section__title').lastChild.textContent.trim());
 
diff --git a/src/parsers/problem/OIClassProblemParser.ts b/src/parsers/problem/OIClassProblemParser.ts
new file mode 100644
index 0000000..5b70eae
--- /dev/null
+++ b/src/parsers/problem/OIClassProblemParser.ts
@@ -0,0 +1,6 @@
+import { HydroProblemParser } from './HydroProblemParser';
+
+export class OIClassProblemParser extends HydroProblemParser {
+  protected domain = 'oiclass.com';
+  protected judge = 'oiClass';
+}