Compilare: main.cpp: In function 'bool cmp(interval, interval)': main.cpp:47:42: warning: suggest parentheses around '&&' within '||' [-Wparentheses] return ( a.dr < b.dr || a.dr == b.dr && a.st <= b.st ); ~~~~~~~~~~~~~^~~~~~~~~~~~~~~ main.cpp: In function 'char chr()': main.cpp:16:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread( buf, 1, SIZE, fin ); ^