ordonare.cpp: In function `int comp(int, int)': ordonare.cpp:16: warning: comparison between signed and unsigned integer expressions ordonare.cpp: In function `int main()': ordonare.cpp:30: warning: comparison between signed and unsigned integer expressions ordonare.cpp:32: warning: comparison between signed and unsigned integer expressions ordonare.cpp:42: warning: passing NULL used for non-pointer argument 3 of `void std::fill(_ForwardIter, _ForwardIter, const _Tp&) [with _ForwardIter = char*, _Tp = int]' ordonare.cpp:44: warning: passing NULL used for non-pointer argument 3 of `void std::fill(_ForwardIter, _ForwardIter, const _Tp&) [with _ForwardIter = char*, _Tp = int]' ordonare.cpp:46: warning: passing NULL used for non-pointer argument 3 of `void std::fill(_ForwardIter, _ForwardIter, const _Tp&) [with _ForwardIter = char*, _Tp = int]'