Compilare: user.cpp: In function ‘void df(int)’: user.cpp:34:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (where == now.size() ){ ^ user.cpp: In function ‘int main()’: user.cpp:59:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < sl.size() && sl[i] < b; i++) ^ user.cpp:50:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cumpanit.in", "r", stdin); ^ user.cpp:51:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("cumpanit.out", "w", stdout); ^ user.cpp:52:31: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lld%lld", &a, &b); ^