grup.cpp: In function `int main()': grup.cpp:32: warning: passing NULL used for non-pointer argument 3 of `void std::fill(_ForwardIter, _ForwardIter, const _Tp&) [with _ForwardIter = char*, _Tp = int]' grup.cpp:36: warning: passing NULL used for non-pointer argument 3 of `void std::fill(_ForwardIter, _ForwardIter, const _Tp&) [with _ForwardIter = char*, _Tp = int]' grup.cpp:39: warning: passing NULL used for non-pointer argument 3 of `void std::fill(_ForwardIter, _ForwardIter, const _Tp&) [with _ForwardIter = char*, _Tp = int]' grup.cpp:42: warning: comparison between signed and unsigned integer expressions grup.cpp:29: warning: `int nra' might be used uninitialized in this function grup.cpp:29: warning: `int nrb' might be used uninitialized in this function