Compilare: user.cpp: In function ‘int main()’: user.cpp:21:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((*it)==x[3]) w=0; ^ user.cpp:30:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((*it)==h) w=0; ^ user.cpp:17:12: warning: array subscript is above array bounds [-Warray-bounds] { x[3]=(c*x[2]+d*x[1])%e; ^ user.cpp:23:27: warning: array subscript is above array bounds [-Warray-bounds] x[1]=x[2];x[2]=x[3]; ^