Compilare: main.cpp: In function 'int main()': main.cpp:105:23: warning: unused variable 'b' [-Wunused-variable] 105 | int a,b; | ^ main.cpp: In static member function 'static node* pheap::merge_pairs(std::vector<node*>&)': main.cpp:55:20: warning: control reaches end of non-void function [-Wreturn-type] 55 | merge_pairs(chd); | ~~~~~~~~~~~^~~~~ main.cpp: In function 'int main()': main.cpp:106:19: warning: 'a' may be used uninitialized [-Wmaybe-uninitialized] 106 | h[a-1].merge(h[n-1]); | ^ main.cpp:105:21: note: 'a' was declared here 105 | int a,b; | ^