foo.cc: In function 'int main()':
foo.cc:50:34: warning: unused variable 'd' [-Wunused-variable]
   50 |             int u=Q.top().second,d=-Q.top().first;
      |                                  ^
foo.cc:64:34: warning: unused variable 'd' [-Wunused-variable]
   64 |             int u=Q.top().second,d=-Q.top().first;
      |                                  ^

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