Compilare: user.cpp: In function ‘void conex(int)’: user.cpp:19:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int it=0;it<a[k].size();++it) ^ user.cpp: In function ‘void df(int)’: user.cpp:31:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<a[k].size();++i) ^ user.cpp: In function ‘int main()’: user.cpp:66:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<curr.size();++j) ^ user.cpp:84:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<sol.size();++i) ^