Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:14:17: error: ‘j’ was not declared in this scope for(j=i; j<=n; j+=i) ^ user.cpp:17:9: error: ‘sum’ was not declared in this scope sum+=v[i]; ^ user.cpp:18:17: error: ‘sum’ was not declared in this scope printf("%d",sum*2-1); ^ user.cpp:6:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.in","r",stdin); ^ user.cpp:7:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("fractii.out","w",stdout); ^ user.cpp:9:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^