core: 添加IOI赛制

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.13.45",
+    "version": "2.13.46",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",

packages/hydrooj/src/model/contest.ts

@@ -205,6 +205,13 @@ const oi: ContestRule = {
     rank: (tsdocs) => ranked(tsdocs, (a, b) => a.score === b.score),
 };
 
+const ioi: ContestRule = {
+    ...oi,
+    TEXT: 'IOI',
+    showRecord: () => true,
+    showScoreboard: () => true,
+};
+
 const homework: ContestRule = {
     TEXT: 'Assignment',
     check: () => { },
@@ -347,7 +354,7 @@ const homework: ContestRule = {
 };
 
 export const RULES: ContestRules = {
-    acm, oi, homework,
+    acm, oi, homework, ioi,
 };
 
 function _getStatusJournal(tsdoc) {