Compilare: user.cpp: In function ‘void rectify(std::vector<int>&, int&, int)’: user.cpp:69:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pointer < dq.size() && edges[dq[pointer]].takeOff > atMost) ^ user.cpp: In function ‘void add(std::vector<int>&, int&, int)’: user.cpp:74:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (pointer < dq.size() && edges[dq.back()].dp >= edges[edge].dp) ^ user.cpp: In function ‘int getMinCost(int, bool)’: user.cpp:100:67: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (takeOffPointers[node] < sortedByTakeOff[node].size()) ^ user.cpp:111:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (_pointer < _dq.size()) ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:13:43: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:35:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^