diff --git a/.github/actions/setup/action.yml b/.github/actions/setup/action.yml
new file mode 100644
index 00000000..9c545fc6
--- /dev/null
+++ b/.github/actions/setup/action.yml
@@ -0,0 +1,15 @@
+name: 'Install LLVM'
+runs:
+  using: "composite"
+  steps:
+    - name: Install LLVM
+      shell: bash
+      run: |
+        wget https://apt.llvm.org/llvm.sh
+        chmod +x llvm.sh
+        sudo ./llvm.sh 22
+        sudo apt-get update
+        sudo apt-get install -y clang-format-22 clang-tidy-22
+        clang-22 --version
+        clang-format-22 --version
+        clang-tidy-22 --version
diff --git a/.github/workflows/programming_team_code_ci.yml b/.github/workflows/programming_team_code_ci.yml
index e57b32b8..563f0f51 100644
--- a/.github/workflows/programming_team_code_ci.yml
+++ b/.github/workflows/programming_team_code_ci.yml
@@ -35,17 +35,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - name: Install LLVM
-      run: |
-        wget https://apt.llvm.org/llvm.sh
-        chmod +x llvm.sh
-        sudo ./llvm.sh 22
+    - uses: ./.github/actions/setup
     - name: Install dependencies
-      run: sudo apt install -y clang-format-22 cppcheck
-    - name: Verify
-      run: |
-        clang-22 --version
-        clang-format-22 --version
+      run: sudo apt install -y cppcheck
     - name: grep, clang-format, cppcheck
       run: make --directory=tests/ grep_clangformat_cppcheck
 
@@ -53,17 +45,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - name: Install LLVM
-      run: |
-        wget https://apt.llvm.org/llvm.sh
-        chmod +x llvm.sh
-        sudo ./llvm.sh 22
-    - name: Install dependencies
-      run: sudo apt install -y clang-tidy-22
-    - name: Verify
-      run: |
-        clang-22 --version
-        clang-tidy-22 --version
+    - uses: ./.github/actions/setup
     - name: clang-tidy
       run: make --directory=tests/ clangtidy
 
@@ -78,14 +60,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
-    - name: Install LLVM
-      run: |
-        wget https://apt.llvm.org/llvm.sh
-        chmod +x llvm.sh
-        sudo ./llvm.sh 22
-    - name: Verify
-      run: |
-        clang-22 --version
+    - uses: ./.github/actions/setup
     - name: g++ with clang
       run: make --directory=tests/ compile_clang
 
@@ -100,17 +75,9 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4
+    - uses: ./.github/actions/setup
     - name: Install texlive, rename, nodejs, npm
-      run: |
-        sudo apt install texlive texlive-latex-extra rename nodejs npm
-    - name: Install LLVM
-      run: |
-        wget https://apt.llvm.org/llvm.sh
-        chmod +x llvm.sh
-        sudo ./llvm.sh 22
-    - name: Verify
-      run: |
-        clang-22 --version
+      run: sudo apt install texlive texlive-latex-extra rename nodejs npm
     - name: build pdf
       run: make --directory=tests/ build_pdf
     - uses: actions/upload-artifact@v4
@@ -142,17 +109,7 @@ jobs:
     if: github.ref == 'refs/heads/dev' && github.event_name == 'push'
     steps:
     - uses: actions/checkout@v4
-    - name: Install LLVM
-      run: |
-        wget https://apt.llvm.org/llvm.sh
-        chmod +x llvm.sh
-        sudo ./llvm.sh 22
-    - name: Install dependencies
-      run: sudo apt install -y clang-format-22 cppcheck
-    - name: Verify
-      run: |
-        clang-22 --version
-        clang-format-22 --version
+    - uses: ./.github/actions/setup
     - name: Combine includes and force push to main branch
       run: |
         git config --local user.name github-actions
diff --git a/.verify-helper/timestamps.remote.json b/.verify-helper/timestamps.remote.json
index 0a14faf8..fbe4997b 100644
--- a/.verify-helper/timestamps.remote.json
+++ b/.verify-helper/timestamps.remote.json
@@ -5,7 +5,7 @@
 "tests/library_checker_aizu_tests/convolution/xor_convolution.test.cpp": "2026-03-06 12:17:28 -0700",
 "tests/library_checker_aizu_tests/data_structures/binary_search_example.test.cpp": "2024-11-18 10:51:39 -0600",
 "tests/library_checker_aizu_tests/data_structures/binary_trie.test.cpp": "2026-01-18 02:20:40 +0000",
-"tests/library_checker_aizu_tests/data_structures/bit.test.cpp": "2026-04-06 12:17:32 -0600",
+"tests/library_checker_aizu_tests/data_structures/bit.test.cpp": "2026-04-12 11:07:55 -0600",
 "tests/library_checker_aizu_tests/data_structures/bit_inc.test.cpp": "2026-04-06 12:17:32 -0600",
 "tests/library_checker_aizu_tests/data_structures/bit_inc_walk.test.cpp": "2026-04-06 12:17:32 -0600",
 "tests/library_checker_aizu_tests/data_structures/bit_ordered_set.test.cpp": "2026-04-06 12:17:32 -0600",
@@ -147,5 +147,4 @@
 "tests/library_checker_aizu_tests/trees/lca_all_methods_aizu.test.cpp": "2026-04-06 14:41:55 -0600",
 "tests/library_checker_aizu_tests/trees/lca_all_methods_lib_checker.test.cpp": "2026-04-06 14:41:55 -0600",
 "tests/library_checker_aizu_tests/trees/shallowest_aizu_tree_height.test.cpp": "2026-04-12 10:51:29 -0600",
-"tests/library_checker_aizu_tests/trees/subtree_isomorphism.test.cpp": "2026-04-06 14:41:55 -0600"
 }
\ No newline at end of file
diff --git a/tests/library_checker_aizu_tests/data_structures/bit.test.cpp b/tests/library_checker_aizu_tests/data_structures/bit.test.cpp
index 3f80ba46..3f32e9e2 100644
--- a/tests/library_checker_aizu_tests/data_structures/bit.test.cpp
+++ b/tests/library_checker_aizu_tests/data_structures/bit.test.cpp
@@ -48,7 +48,7 @@ int main() {
       assert(res == bit_rr.query(l, r));
       cout << res << '\n';
     }
-    auto sum = rnd<ll>(0LL, (ll)(1e12));
+    auto sum = rnd<ll>(0LL, (ll)1e12);
     auto need = sum;
     auto f = [&](ll x, int tl, int tr) -> bool {
       assert(tl <= tr);
diff --git a/tests/library_checker_aizu_tests/trees/shallowest_lib_checker_tree_path_composite.test.cpp b/tests/library_checker_aizu_tests/trees/shallowest_lib_checker_tree_path_composite.test.cpp
index 3bf75f7f..dd174ba1 100644
--- a/tests/library_checker_aizu_tests/trees/shallowest_lib_checker_tree_path_composite.test.cpp
+++ b/tests/library_checker_aizu_tests/trees/shallowest_lib_checker_tree_path_composite.test.cpp
@@ -87,8 +87,7 @@ int main() {
     for (int v : adj[cent]) {
       for (int i = 0; i < ssize(adj[v]); i++) {
         if (adj[v][i] == cent) {
-          swap(weight[v][i], weight[v].back());
-          weight[v].pop_back();
+          weight[v].erase(begin(weight[v]) + i);
           break;
         }
       }