/in/foo.cc: In function 'int main()':
/in/foo.cc:92:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   92 |                 auto [u, visited] = st.top();
      |                      ^
/in/foo.cc:136:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  136 |                 auto [u, visited] = st.top();
      |                      ^

ValueError("invalid literal for int() with base 10: '[global]\\n'")