diff --git a/.github/workflows/cpp.yml b/.github/workflows/cpp.yml
index 470dac77..78f11174 100644
--- a/.github/workflows/cpp.yml
+++ b/.github/workflows/cpp.yml
@@ -3,8 +3,8 @@ name: C++ CI
 on: [push]
 
 jobs:
-  build-ubuntu-gcc-13:
-    runs-on: ubuntu-latest
+  build-ubuntu-gcc-14:
+    runs-on: ubuntu-24.02
     strategy:
       matrix:
         config:
@@ -13,14 +13,14 @@ jobs:
           - {compiler-options: "-fanalyzer -Wno-analyzer-null-dereference -std=c++23"}
     steps:
       - uses: actions/checkout@v2
-      - name: install g++
-        run: |
-          sudo add-apt-repository ppa:ubuntu-toolchain-r/test
-          sudo apt-get install g++-13
+#      - name: install g++
+#        run: |
+#          sudo add-apt-repository ppa:ubuntu-toolchain-r/test
+#          sudo apt-get install g++-14
       - name: compile
         run: |
           cd cpp
-          find . -name '*.cpp' -print0 | xargs -n1 -0 g++-13 ${{ matrix.config.compiler-options }}
+          find . -name '*.cpp' -print0 | xargs -n1 -0 g++-14 ${{ matrix.config.compiler-options }}
 
   build-ubuntu-clang:
     runs-on: ubuntu-latest
@@ -29,12 +29,12 @@ jobs:
     - name: install clang
       run: |
         sudo apt-key adv --fetch-keys https://apt.llvm.org/llvm-snapshot.gpg.key
-        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-17 main"
-        sudo apt-get install clang-17
+        sudo add-apt-repository "deb http://apt.llvm.org/focal/ llvm-toolchain-focal-18 main"
+        sudo apt-get install clang-18
     - name: compile
       run: |
         cd cpp
-        find . -name '*.cpp' -print0 | xargs -n1 -0 clang++-17 -Wall -Wextra -std=c++2b
+        find . -name '*.cpp' -print0 | xargs -n1 -0 clang++-18 -Wall -Wextra -std=c++23
 
   build-macos-clang:
     runs-on: macos-latest
@@ -49,7 +49,7 @@ jobs:
         run: |
           cd cpp
           mkdir bits
-          echo $'#include <vector>\n#include <set>\n#include <map>\n#include <unordered_set>\n#include <unordered_map>\n#include <queue>\n#include <deque>\n#include <stack>\n#include <iostream>\n#include <iomanip>\n#include <complex>\n#include <cassert>\n#include <random>\n#include <chrono>\n#include <functional>\n#include <array>\n#include <bitset>\n#include <numeric>\n' > bits/stdc++.h
+          echo $'#include <algorithm>\n#include <iterator>\n#include <vector>\n#include <set>\n#include <map>\n#include <unordered_set>\n#include <unordered_map>\n#include <queue>\n#include <deque>\n#include <stack>\n#include <iostream>\n#include <iomanip>\n#include <complex>\n#include <cassert>\n#include <random>\n#include <chrono>\n#include <functional>\n#include <array>\n#include <bitset>\n#include <numeric>\n' > bits/stdc++.h
           find . -name '*.cpp' -print0 | xargs -n1 -0 clang++ ${{ matrix.config.compiler-options }} .
 
   build-windows-visual-cpp-17:
diff --git a/cpp/numbertheory/discrete_root.cpp b/cpp/numbertheory/discrete_root.cpp
index e3293611..7ce2dcc4 100644
--- a/cpp/numbertheory/discrete_root.cpp
+++ b/cpp/numbertheory/discrete_root.cpp
@@ -12,7 +12,7 @@ int pow_mod(int x, int n, int mod) {
     return res;
 }
 
-int generator(int m) {
+int calc_generator(int m) {
     if (m == 2)
         return 1;
     vector<int> factors;
@@ -43,7 +43,7 @@ int generator(int m) {
 int discrete_root(int a, int b, int m) {
     if (a == 0)
         return -1;
-    int g = generator(m);
+    int g = calc_generator(m);
     int sq = (int)sqrt(m) + 1;
     vector<pair<int, int>> dec(sq);
     for (int i = 1; i <= sq; ++i)
diff --git a/cpp/numbertheory/primitive_root.cpp b/cpp/numbertheory/primitive_root.cpp
index 1f138efc..b9f26510 100644
--- a/cpp/numbertheory/primitive_root.cpp
+++ b/cpp/numbertheory/primitive_root.cpp
@@ -28,7 +28,7 @@ int totient_function(int n) {
 // returns g such that g^i runs through all numbers from 1 to m-1 modulo m
 // g exists for m = 2,4,p^a,2*p^a, where p > 2 is a prime number
 // O(m^0.5) complexity
-int generator(int m) {
+int calc_generator(int m) {
     if (m == 2)
         return 1;
     vector<int> factors;
@@ -57,7 +57,7 @@ int generator(int m) {
 // usage example
 int main() {
     for (int i = 0; i < 15; ++i) {
-        cout << "generator(" << i << ") = " << generator(i) << endl;
+        cout << "generator(" << i << ") = " << calc_generator(i) << endl;
     }
-    cout << "generator(" << 998244353 << ") = " << generator(998244353) << endl;
+    cout << "generator(" << 998244353 << ") = " << calc_generator(998244353) << endl;
 }