Compilare: main.cpp: In function 'int main()': main.cpp:66:46: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'll {aka long int}' [-Wformat=] printf ("%lld\n", solve (b) - solve (a - 1)); ^ main.cpp:57:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("divk.in", "r", stdin); ^ main.cpp:58:36: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen ("divk.out", "w", stdout); ^ main.cpp: In function 'char advance()': main.cpp:38:35: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] fread (buffer, SIZE, 1, stdin); ^