Eroare de compilare: user.cpp:2:1: error: ‘ifstream’ does not name a type ifstream fin("submultimi.in");ofstream fout("submultimi.out");int main() {int n;fin>>n;for(int x=1;x<1<<n;x++) {for(int i=0;i<n;i++){if(x&(1<<i)){fout<<i+1<<" ";}}fout<<"\n";}return 0;} ^ user.cpp:2:31: error: ‘ofstream’ does not name a type ifstream fin("submultimi.in");ofstream fout("submultimi.out");int main() {int n;fin>>n;for(int x=1;x<1<<n;x++) {for(int i=0;i<n;i++){if(x&(1<<i)){fout<<i+1<<" ";}}fout<<"\n";}return 0;} ^ user.cpp: In function ‘int main()’: user.cpp:2:81: error: ‘fin’ was not declared in this scope ifstream fin("submultimi.in");ofstream fout("submultimi.out");int main() {int n;fin>>n;for(int x=1;x<1<<n;x++) {for(int i=0;i<n;i++){if(x&(1<<i)){fout<<i+1<<" ";}}fout<<"\n";}return 0;} ^ user.cpp:2:147: error: ‘fout’ was not declared in this scope ifstream fin("submultimi.in");ofstream fout("submultimi.out");int main() {int n;fin>>n;for(int x=1;x<1<<n;x++) {for(int i=0;i<n;i++){if(x&(1<<i)){fout<<i+1<<" ";}}fout<<"\n";}return 0;} ^ user.cpp:2:164: error: ‘fout’ was not declared in this scope ifstream fin("submultimi.in");ofstream fout("submultimi.out");int main() {int n;fin>>n;for(int x=1;x<1<<n;x++) {for(int i=0;i<n;i++){if(x&(1<<i)){fout<<i+1<<" ";}}fout<<"\n";}return 0;} ^