View Compilation Error

0_0_20849980_10351.cpp: In function 'int main(int, const char**)':
0_0_20849980_10351.cpp:13:2: error: 'cin' was not declared in this scope
  cin>>t;
  ^
0_0_20849980_10351.cpp:20:4: error: 'cout' was not declared in this scope
    cout<<"YES"<<endl;
    ^
0_0_20849980_10351.cpp:20:17: error: 'endl' was not declared in this scope
    cout<<"YES"<<endl;
                 ^
0_0_20849980_10351.cpp:23:4: error: 'cout' was not declared in this scope
    cout<<"NO"<<endl;
    ^
0_0_20849980_10351.cpp:23:16: error: 'endl' was not declared in this scope
    cout<<"NO"<<endl;
                ^