Compilare: user.cpp: In function ‘void lee(int, int, int, int)’: user.cpp:72:36: warning: statement has no effect [-Wunused-value] if(xv==z&&yv==t) ok==1; ^ user.cpp: In function ‘void fill(int, int, int&)’: user.cpp:44:38: warning: ‘yv’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(interior(xv,yv)&&a1[xv][yv]==-1) ^ user.cpp:44:38: warning: ‘xv’ may be used uninitialized in this function [-Wmaybe-uninitialized]