Compilare: user.cpp: In function ‘int main()’: user.cpp:42:8: warning: unused variable ‘ans’ [-Wunused-variable] int i,ans=1,a,b,x,dist,best=0,y,j,nxt,prv; ^ user.cpp:42:14: warning: unused variable ‘a’ [-Wunused-variable] int i,ans=1,a,b,x,dist,best=0,y,j,nxt,prv; ^ user.cpp:42:16: warning: unused variable ‘b’ [-Wunused-variable] int i,ans=1,a,b,x,dist,best=0,y,j,nxt,prv; ^ user.cpp:69:21: warning: ‘second’ may be used uninitialized in this function [-Wmaybe-uninitialized] int newy=y+dcol[i]; ^ user.cpp:68:21: warning: ‘first’ may be used uninitialized in this function [-Wmaybe-uninitialized] int newx=x+dlin[i]; ^