core: update rating calculation

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "3.8.1",
+    "version": "3.8.2",
     "bin": "bin/hydrooj.js",
     "main": "src/loader",
     "module": "src/loader",

packages/hydrooj/src/script/rating.ts

@@ -54,15 +54,15 @@ export const RpTypes: Record<string, RpDef> = {
     contest: {
         async run(domainIds, udict, report) {
             const contests: Tdoc<30>[] = await contest.getMulti('', { domainId: { $in: domainIds }, rated: true })
-                .sort({ _id: 1 }).toArray() as any;
+                .limit(10).toArray() as any;
             if (contests.length) await report({ message: `Found ${contests.length} contests in ${domainIds[0]}` });
-            for (const tdoc of contests) {
+            for (const tdoc of contests.reverse()) {
                 const start = Date.now();
                 const cursor = contest.getMultiStatus(tdoc.domainId, {
                     docId: tdoc.docId,
                     journal: { $ne: null },
                 }).sort(contest.RULES[tdoc.rule].statusSort);
-                if (!await cursor.count()) return;
+                if (!await cursor.count()) continue;
                 const [rankedTsdocs] = await contest.RULES[tdoc.rule].ranked(tdoc, cursor);
                 const users = rankedTsdocs.map((i) => ({ uid: i[1].uid, rank: i[0], old: udict[i[1].uid] }));
                 // FIXME sum(rating.new) always less than sum(rating.old)
@@ -77,7 +77,7 @@ export const RpTypes: Record<string, RpDef> = {
                     },
                 });
             }
-            for (const key in udict) udict[key] = udict[key] / 2 - 700;
+            for (const key in udict) udict[key] = max(1, udict[key] / 4 - 375);
         },
         hidden: false,
         base: 1500,