Compilare: user.cpp: In function ‘int main()’: user.cpp:35:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<hol.size()/2;i++) ^ user.cpp:76:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<hol.size() ;i++) ^ user.cpp:78:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<hol2.size() ;j++) ^ user.cpp:92:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<hol.size() ;i++) ^ user.cpp:94:42: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j=0;j<hol2.size() ;j++) ^