Compilare: user.cpp: In function ‘int main()’: user.cpp:43:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<res.size();++i) printf("%0.6lf\n",res[i]); ^ user.cpp:15:13: warning: unused variable ‘j’ [-Wunused-variable] int n,i,j,v; ^ user.cpp:13:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.in","r",stdin); ^ user.cpp:14:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("xmoto.out","w",stdout); ^ user.cpp:18:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lf",&n,&l); ^ user.cpp:21:55: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf %lf %lf %d",&ai,&bi,&ki,&qi,&v); ^