Compilare: main.cpp: In function 'int main()': main.cpp:18:19: warning: unused variable 'a' [-Wunused-variable] long long a=pq.top().first,b=pq.top().second; ^ main.cpp:18:36: warning: unused variable 'b' [-Wunused-variable] long long a=pq.top().first,b=pq.top().second; ^