/in/foo.cc: In function 'int main()':
/in/foo.cc:29:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   29 |         auto [cur, steps] = q.front();
      |              ^
/in/foo.cc:34:18: warning: narrowing conversion of 'floor((1.2e+0 * (double)cur))' from 'double' to 'int' [-Wnarrowing]
   34 |             floor(1.2 * cur),  // 注意：1.2 * cur 要加括号
      |             ~~~~~^~~~~~~~~~~