Compilare: user.cpp: In function ‘void afis(int)’: user.cpp:21:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(i<v.size())fout<<v[i]; ^ user.cpp: In function ‘int main()’: user.cpp:37:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<s.size();++i) ^ user.cpp:54:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v.size();++i) ^ user.cpp:67:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=beg;i<v.size()-1;++i) ^ user.cpp:32:9: warning: unused variable ‘z’ [-Wunused-variable] int z; ^