core: fix training_detail.progress display

packages/hydrooj/package.json

@@ -1,6 +1,6 @@
 {
     "name": "hydrooj",
-    "version": "2.26.15",
+    "version": "2.26.16",
     "bin": "bin/hydrooj.js",
     "main": "dist/loader.js",
     "typings": "dist/loader.d.ts",

packages/hydrooj/src/handler/training.ts

@@ -123,7 +123,7 @@ class TrainingDetailHandler extends Handler {
         for (const node of tdoc.dag) {
             ndict[node._id] = node;
             const totalCount = node.pids.length;
-            const doneCount = Set.union(new Set(node.pids), donePids).size;
+            const doneCount = Set.intersection(new Set(node.pids), donePids).size;
             const nsdoc = {
                 progress: totalCount ? Math.floor(100 * (doneCount / totalCount)) : 100,
                 isDone: training.isDone(node, doneNids, donePids),