Compilare: main.cpp: In function 'void GetIntervals(int)': main.cpp:75:13: warning: unused variable 'st' [-Wunused-variable] int st = a, dr = n, ans = a; ^~ main.cpp:75:21: warning: unused variable 'dr' [-Wunused-variable] int st = a, dr = n, ans = a; ^~ main.cpp: In member function 'char InParser::read_ch()': main.cpp:17:29: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, 4096, fin); ^