View Compilation Error

0_0_20325350_18090.cpp: In function 'int main()':
0_0_20325350_18090.cpp:3:5: error: 'ios' has not been declared
     ios::sync_with_stdio(false);
     ^
0_0_20325350_18090.cpp:6:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^
0_0_20325350_18090.cpp:7:5: error: 'a' was not declared in this scope
     a[0]=0;
     ^
0_0_20325350_18090.cpp:27:9: error: 'cout' was not declared in this scope
         cout<<"Case #"<<nu++<<": "<<alltime<<endl;
         ^
0_0_20325350_18090.cpp:27:46: error: 'endl' was not declared in this scope
         cout<<"Case #"<<nu++<<": "<<alltime<<endl;
                                              ^