Compilare: main.cpp: In member function 'void InputReader::advance()': main.cpp:33:51: 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); ^ main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:11:47: 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); ^ main.cpp: In function 'int main()': main.cpp:111:33: warning: 'total' may be used uninitialized in this function [-Wmaybe-uninitialized] for (int i = x+1; i <= total; i ++) { ~~^~~~~~~~