Compilare: user.cpp: In function ‘int main()’: user.cpp:131:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < coords.size(); i++) { ^ user.cpp:155:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < coords.size(); i++) { ^ user.cpp:226:54: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < eventsPoints[i].size(); j++) { ^ user.cpp:230:52: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < rectangles[i].size(); j++) { ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:36:48: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUFFER_SIZE, 1, file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:63:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, BUFFER_SIZE, 1, file); ^