Compilare: user.cpp: In function ‘int main()’: user.cpp:27:15: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(a[i]!=-1) ^ user.cpp:11:13: warning: unused variable ‘x’ [-Wunused-variable] int i,V,x,y,cnt,imax,j,i1,j1; ^ user.cpp:11:15: warning: unused variable ‘y’ [-Wunused-variable] int i,V,x,y,cnt,imax,j,i1,j1; ^ user.cpp:44:19: warning: ‘imax’ may be used uninitialized in this function [-Wmaybe-uninitialized] i1=i-1; ^