Compilare: user.cpp: In function ‘bool ok(long long int)’: user.cpp:15:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while ( last <= m ) { ^ user.cpp:29:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0 ; i < n ; i ++ ){ ^ user.cpp: In function ‘int main()’: user.cpp:48:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=1;i<=m;i++){ ^ user.cpp:65:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( int i = 1 ; i <= m ; i ++ ){ ^ user.cpp:61:14: warning: ‘limax’ may be used uninitialized in this function [-Wmaybe-uninitialized] fo<<limax; ^