Eroare de compilare: user.cpp:28:38: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] char usedInstances[MAX_VAL] = { NULL }; ^ In file included from /usr/include/c++/4.8/algorithm:62:0, from user.cpp:5: /usr/include/c++/4.8/bits/stl_algo.h: In instantiation of ‘_RandomAccessIterator std::__unguarded_partition(_RandomAccessIterator, _RandomAccessIterator, const _Tp&, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Suspect*, std::vector<Suspect> >; _Tp = Suspect; _Compare = bool (*)(Suspect&, Suspect&)]’: /usr/include/c++/4.8/bits/stl_algo.h:2319:78: required from ‘_RandomAccessIterator std::__unguarded_partition_pivot(_RandomAccessIterator, _RandomAccessIterator, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Suspect*, std::vector<Suspect> >; _Compare = bool (*)(Suspect&, Suspect&)]’ /usr/include/c++/4.8/bits/stl_algo.h:2360:62: required from ‘void std::__introsort_loop(_RandomAccessIterator, _RandomAccessIterator, _Size, _Compare) [with _RandomAccessIterator = __gnu_cxx::__normal_iterator<Suspect*, std::vector<Suspect> >; _Size = int; _Compare = bool (*)(Suspect&, Suspect&)]’ /usr/include/c++/4.8/bits/stl_algo.h:5513:44: required from ‘void std::sort(_RAIter, _RAIter, _Compare) [with _RAIter = __gnu_cxx::__normal_iterator<Suspect*, std::vector<Suspect> >; _Compare = bool (*)(Suspect&, Suspect&)]’ user.cpp:245:51: required from here /usr/include/c++/4.8/bits/stl_algo.h:2287:35: error: invalid initialization of reference of type ‘Suspect&’ from expression of type ‘const Suspect’ while (__comp(*__first, __pivot)) ^ /usr/include/c++/4.8/bits/stl_algo.h:2290:34: error: invalid initialization of reference of type ‘Suspect&’ from expression of type ‘const Suspect’ while (__comp(__pivot, *__last)) ^ user.cpp: In function ‘void Read()’: user.cpp:51:26: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &p); ^ user.cpp:52:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &r, &c, &d); ^ user.cpp:58:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &aeroport[i][j]); ^