Compilare: user.cpp: In function ‘ll dp(int, int, int, int, bool)’: user.cpp:20:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(step == vec.size()) ^ user.cpp:24:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if((vec.size() - step) * 9 < left_with) ^ user.cpp: In function ‘int main()’: user.cpp:49:40: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("peluzanord.in", "r", stdin); ^ user.cpp:50:42: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("peluzanord.out", "w", stdout); ^ user.cpp:52:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld", &a, &b); ^