Compilare: main.cpp: In function 'int Val_idx(const int&)': main.cpp:45:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 0; i < Hash[m].size(); ++i ) ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'void Do()': main.cpp:121:9: warning: unused variable 'old_median' [-Wunused-variable] int old_median; ^~~~~~~~~~ main.cpp: In function 'int Val_idx(const int&)': main.cpp:47:1: warning: control reaches end of non-void function [-Wreturn-type] } ^