Compilare: user.cpp: In function ‘int main()’: user.cpp:98:29: warning: ‘b’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[vi[st]][vj[st]]=-2; ^ user.cpp:101:13: warning: ‘x’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(vi[st]==x && vj[st]==y) ^ user.cpp:101:26: warning: ‘y’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(vi[st]==x && vj[st]==y) ^ user.cpp:98:29: warning: ‘a’ may be used uninitialized in this function [-Wmaybe-uninitialized] v[vi[st]][vj[st]]=-2; ^