Compilare: user.cpp: In function ‘int main()’: user.cpp:61:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol==(v.size()-1) && !(x%a[v[v.size()-1]])) ok=1; ^ user.cpp:63:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(sol>0 && sol<(v.size()-1) && !(x%a[v[sol]]) && !(a[v[sol+1]]%x)) ok=1; ^ user.cpp:13:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divseq.in","r",stdin); ^ user.cpp:14:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("divseq.out","w",stdout); ^ user.cpp:15:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:16:44: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(int i=1;i<=n;i++) scanf("%d",&a[i]); ^