Compilare: user.cpp: In function ‘void add_best_edge(std::vector<long long int>&, std::vector<long long int>&)’: user.cpp:92:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos + 1 < B.size()) { ^ user.cpp:103:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pos + 1 < A.size()) { ^ user.cpp: In function ‘int main()’: user.cpp:142:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 1; i < street.size(); i++) ^ user.cpp:119:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("campanie.out","w",stdout); ^ user.cpp: In member function ‘void Buffer::refill()’: user.cpp:52:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&data[0], 1, dim, stdin); ^ user.cpp: In constructor ‘Buffer::Buffer(std::string, int)’: user.cpp:23:46: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(name.c_str(), "r", stdin); ^