Compilare: user.cpp: In function ‘int main()’: user.cpp:190:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<fata1.size();++i) ^ user.cpp:192:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<fata2.size();++i) ^ user.cpp:194:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<fata3.size();++i) ^ user.cpp:196:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<fata4.size();++i) ^ user.cpp: In function ‘int mk(int, int, int)’: user.cpp:91:1: warning: control reaches end of non-void function [-Wreturn-type] } ^