Compilare: main.cpp: In function 'bool cmp(interval, interval)': main.cpp:103:42: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return ( a.dr < b.dr || a.dr == b.dr && a.st <= b.st ); ~~~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'char readChar()': main.cpp:25:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread( rbuf, 1, BUFSIZE, fin ); ^