Eroare de compilare: user.cpp:2:67: error: expected initializer before ‘fin’ using namespace std;unsigned long long s[1000001],n,i,j,rifstream fin("fractii.in");ofstream fout("fractii.out");int main(){fin>>n;for(i=2;i<=n;i++){s[i]=i-1;}for(i=2;i<=n;i++){r+=s[i];for(j=i+i;j<=n;j=j+i){s[j]-=s[i];}}r*=2;fout<<r+1;} ^ user.cpp: In function ‘int main()’: user.cpp:2:125: error: ‘fin’ was not declared in this scope using namespace std;unsigned long long s[1000001],n,i,j,rifstream fin("fractii.in");ofstream fout("fractii.out");int main(){fin>>n;for(i=2;i<=n;i++){s[i]=i-1;}for(i=2;i<=n;i++){r+=s[i];for(j=i+i;j<=n;j=j+i){s[j]-=s[i];}}r*=2;fout<<r+1;} ^ user.cpp:2:178: error: ‘r’ was not declared in this scope using namespace std;unsigned long long s[1000001],n,i,j,rifstream fin("fractii.in");ofstream fout("fractii.out");int main(){fin>>n;for(i=2;i<=n;i++){s[i]=i-1;}for(i=2;i<=n;i++){r+=s[i];for(j=i+i;j<=n;j=j+i){s[j]-=s[i];}}r*=2;fout<<r+1;} ^ user.cpp:2:221: error: ‘r’ was not declared in this scope using namespace std;unsigned long long s[1000001],n,i,j,rifstream fin("fractii.in");ofstream fout("fractii.out");int main(){fin>>n;for(i=2;i<=n;i++){s[i]=i-1;}for(i=2;i<=n;i++){r+=s[i];for(j=i+i;j<=n;j=j+i){s[j]-=s[i];}}r*=2;fout<<r+1;} ^