/in/foo.cc: In function 'void dijkstra(int, ll*, int)':
/in/foo.cc:16:21: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   16 |                 auto[d,u]=pq.top();
      |                     ^
/in/foo.cc:19:25: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   19 |                 for(auto[w,v]:adj[u]) {
      |                         ^