View Compilation Error

0_0_30268531_21535.cpp: In function 'int main()':
0_0_30268531_21535.cpp:5:2: error: 'cin' was not declared in this scope
  cin>>t;
  ^
0_0_30268531_21535.cpp:18:31: error: 'min' was not declared in this scope
     else temp=min(temp,a/(2*i));
                               ^
0_0_30268531_21535.cpp:22:3: error: 'cout' was not declared in this scope
   cout<<temp<<endl;
   ^
0_0_30268531_21535.cpp:22:15: error: 'endl' was not declared in this scope
   cout<<temp<<endl;
               ^