Compilare: user.cpp: In function ‘int main()’: user.cpp:57:14: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] m-=abs(y2-y1); ^ user.cpp:56:14: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] n-=abs(x2-x1); ^ user.cpp:57:14: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] m-=abs(y2-y1); ^ user.cpp:56:14: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] n-=abs(x2-x1); ^