/in/foo.cc: In function 'int main()':
/in/foo.cc:87:18: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   87 |             auto [d,now]=Q.top();
      |                  ^
/in/foo.cc:99:26: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17' [-Wc++17-extensions]
   99 |                 for(auto [to,len]:G[now])
      |                          ^