Compilare: user.cpp: In function ‘int max_cerc(int)’: user.cpp:70:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i;j<m[x].size();j++) ^ user.cpp:80:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i=0;i<m[x].size();i++) ^