Compilare: user.cpp: In function ‘int main()’: user.cpp:43:14: warning: statement has no effect [-Wunused-value] for(j;j<=q;j++) ^ user.cpp:64:14: warning: statement has no effect [-Wunused-value] for(i;i<=q;i++) ^ user.cpp:41:16: warning: ‘j’ may be used uninitialized in this function [-Wmaybe-uninitialized] int q=j+p-1; ^