Compilare: user.cpp: In function ‘int main()’: user.cpp:12:16: warning: ‘y1’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,x1,y1,x2,y2,i,j; ^ user.cpp:49:5: warning: ‘x1’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(i=x1;i<=y1;i++) ^ user.cpp:12:22: warning: ‘y2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,x1,y1,x2,y2,i,j; ^ user.cpp:12:19: warning: ‘x2’ may be used uninitialized in this function [-Wmaybe-uninitialized] int n,m,x1,y1,x2,y2,i,j; ^