Compilare: user.cpp: In function ‘bool accessible()’: user.cpp:19:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (iterator=1;iterator<=destination;++iterator) ^ user.cpp: In function ‘int main()’: user.cpp:78:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=1;i<=n;++i) ^ user.cpp:79:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=1;j<=n;++j) ^ user.cpp:89:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 1; i <= n; ++i) ^ user.cpp:101:14: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<=n;++i) ^ user.cpp:102:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=1;j<=n;++j) ^