Compilare: user.cpp: In function ‘int main()’: user.cpp:18:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[aux].size(); i++) ^ user.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[aux].size(); i++) ^ user.cpp:32:46: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<a[aux].size(); j++) ^ user.cpp:41:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[aux].size(); i++) ^