Challenge

忘れたい過去も gc でおそうじ！

Solution

gcで掃除されたコミットはreflogで見つけましょう

Final Script

# git reflog --all                                                                                   
c0bf20c (HEAD -> main) refs/heads/main@{0}: reset: moving to HEAD~1
75a6ad9 refs/heads/main@{1}: commit: add flag
c0bf20c (HEAD -> main) refs/heads/main@{2}: commit (initial): initial commit
c0bf20c (HEAD -> main) HEAD@{0}: reset: moving to HEAD~1
75a6ad9 HEAD@{1}: commit: add flag

# git show 75a6ad9 
commit 75a6ad9f0abe942df11f90b58f175d553c23c101
Author: AlpacaHack <alpacahack@alpacahack.internal>
Date:   Sat Jan 10 01:45:04 2026 +0900

    add flag

diff --git a/flag.txt b/flag.txt
new file mode 100644
index 0000000..4c820f2
--- /dev/null
+++ b/flag.txt
@@ -0,0 +1 @@