Compilare: user.cpp: In function ‘int main()’: user.cpp:138:23: warning: suggest parentheses around assignment used as truth value [-Wparentheses] vaz[i]=luat[i]=niv[i]=size[i]=lo[i]=first[i]=0; ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:31:51: 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); ^ user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:9:47: 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); ^