Compilare: user.cpp: In function ‘int main()’: user.cpp:3:98: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int s[1000001],v[1000001],v2[1000000];int main(){freopen("xspe.in","r",stdin);freopen("xspe.out","w",stdout);int n,i,k;cin>>n;for(i=1;i<=n;i++){cin>>v[i];}s[1]=v[n];v2[n]=v[n];k=1;for(i=n-1;i>=1;i--){while(s[k]>=v[i]&&k!=0)k--;k++;s[k]=v[i];if(k==1)v2[i]=s[k];else v2[i]=s[k]+s[k-1];}for(i=1;i<=n;i++)cout<<v2[i]<<" ";return 0;} ^ user.cpp:3:129: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] using namespace std;int s[1000001],v[1000001],v2[1000000];int main(){freopen("xspe.in","r",stdin);freopen("xspe.out","w",stdout);int n,i,k;cin>>n;for(i=1;i<=n;i++){cin>>v[i];}s[1]=v[n];v2[n]=v[n];k=1;for(i=n-1;i>=1;i--){while(s[k]>=v[i]&&k!=0)k--;k++;s[k]=v[i];if(k==1)v2[i]=s[k];else v2[i]=s[k]+s[k-1];}for(i=1;i<=n;i++)cout<<v2[i]<<" ";return 0;} ^