Compilare: main.cpp: In function 'int ok(long long int)': main.cpp:79:12: warning: variable 'dr' set but not used [-Wunused-but-set-variable] int i, dr, sol; ^~ main.cpp: In function 'int main()': main.cpp:105:34: 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, 200000, fin); ^