Compilare: main.cpp: In member function 'bool Diapazon::operator<(const Diapazon&) const': main.cpp:34:56: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return right < aux.right || right == aux.right && left > aux.left; ~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'char nextch()': main.cpp:12:36: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buf, BUF_SIZE, 1, fi); ^