/in/foo.cc: In function 'int main()':
/in/foo.cc:160:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  160 |         auto [current_cost, num] = pq.top();
      |              ^
/in/foo.cc:179:26: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  179 |         for (const auto& [new_num, op_cost] : next_states) {
      |                          ^
/in/foo.cc:195:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
  195 |     for (const auto& [num, cost] : dist) {
      |                      ^