Compilare: user.cpp: In function ‘int main()’: user.cpp:49:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (D.size() > U) ^ user.cpp:52:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (D.size() >= L) ^ user.cpp:55:122: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(D.size() > 1 && Div(Cost - C[D.front()],Timp - T[D.front()]) > Div(Cost,Timp) && (N - i >= L - D.size() + 1)) ^ user.cpp:61:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if (D.size() >= L) ^ user.cpp:30:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv3.in","r",stdin); ^ user.cpp:31:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secv3.out","w",stdout); ^ user.cpp:33:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d %d",&N,&L,&U); ^ user.cpp:36:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&C[i]); ^ user.cpp:39:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&T[i]); ^