Compilare: user.cpp: In function ‘int main()’: user.cpp:42:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secventa.in", "r", stdin); ^ user.cpp:43:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secventa.out", "w", stdout); ^ user.cpp: In member function ‘char fastReader::getChar()’: user.cpp:34:52: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, 1, bufferSize, stdin); ^ user.cpp: In function ‘int main()’: user.cpp:65:28: warning: ‘ind’ may be used uninitialized in this function [-Wmaybe-uninitialized] printf("%d %d %d", ind - k + 1, ind, res); ^