Compilare: user.cpp: In function ‘void DF1(int)’: user.cpp:14:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[x].size();i++) ^ user.cpp: In function ‘void DF2(int)’: user.cpp:24:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<vt[x].size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:48:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] {for(j=0;j<sol[i].size();j++) ^