foo.cc: In function 'int main()':
foo.cc:21:22: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   21 |                 auto [x,y,z] = heap.top();
      |                      ^
foo.cc:27:14: warning: structured bindings only available with '-std=c++17' or '-std=gnu++17'
   27 |         auto [x,y,z] = heap.top();
      |              ^

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