From 9a980c4a0bfc8115a9d3cd3bd115e2b3b0b4943b Mon Sep 17 00:00:00 2001
From: undefined <i@undefined.moe>
Date: Fri, 26 Jun 2026 20:33:21 +0800
Subject: [PATCH] judge: handle empty output file (fix #1186)

---
 packages/hydrojudge/src/sandbox.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/hydrojudge/src/sandbox.ts b/packages/hydrojudge/src/sandbox.ts
index 651575d6c..23a840d4d 100644
--- a/packages/hydrojudge/src/sandbox.ts
+++ b/packages/hydrojudge/src/sandbox.ts
@@ -137,7 +137,7 @@ function adaptResult(result: SandboxResult, params: Parameter): SandboxAdaptedRe
     ret.files = result.files || {};
     ret.fileIds = result.fileIds || {};
     if (ret.fileIds[outname]) ret.fileIds.stdout = ret.fileIds[outname];
-    if (params.filename && !ret.fileIds[outname] && !ret.files[outname]) {
+    if (params.filename && !ret.fileIds[outname] && typeof ret.files[outname] !== 'string') {
         result.error = 'Output file not found';
         ret.status = STATUS.STATUS_RUNTIME_ERROR;
     }