Compilare: user.cpp: In function ‘int main()’: user.cpp:24:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<v.size();i=i+2) ^ user.cpp:30:83: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((v[mij+dr]+v[mij-dr]==v[mij+dr-2]+v[mij-dr+2])&&(mij+dr<v.size())&&(mij-dr>=0)) ^ user.cpp:41:68: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ((v[mij2+dr2]+v[mij2-dr2]==sum)&&(mij+dr2<v.size())&&(mij-dr2>=0)) ^