Eroare de compilare: user.cpp:91:1: error: ‘unordered_set’ does not name a type unordered_set<pair<int, int> > was; ^ user.cpp: In function ‘int main()’: user.cpp:106:3: error: ‘was’ was not declared in this scope was.clear(); ^ user.cpp: In member function ‘char InParser::read_ch()’: user.cpp:17:29: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^