Compilare: user.cpp: In function ‘int main()’: user.cpp:9:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i++) ^ user.cpp:11:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=3;i<=n;i++) ^ user.cpp:17:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=2;i<=n;i+=2) ^ user.cpp:24:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=n;i+=2) ^ user.cpp:32:31: warning: ‘q’ may be used uninitialized in this function [-Wmaybe-uninitialized] else fout<<max2+umax2+s-y-q; ^ user.cpp:32:26: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] else fout<<max2+umax2+s-y-q; ^ user.cpp:31:38: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(max3>max2+umax2) fout<<max3+s-x; ^