Compilare: main.cpp: In function 'long long int mezin(long long int)': main.cpp:27:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (fiu.size() == k) ~~~~~~~~~~~^~~~ main.cpp:30:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=1; i<fiu.size(); i++) ~^~~~~~~~~~~ main.cpp:37:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (fiu.size() < k) ~~~~~~~~~~~^~~ main.cpp:40:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (fiu.size() > k) ~~~~~~~~~~~^~~ main.cpp:42:1: warning: control reaches end of non-void function [-Wreturn-type] } ^