View Compilation Error

0_0_19789039_19380.cpp: In function 'int main()':
0_0_19789039_19380.cpp:6:4: error: 'cin' was not declared in this scope
    cin>>t; 
    ^
0_0_19789039_19380.cpp:28:10: error: 'cout' was not declared in this scope
          cout<<min*10<<endl; 
          ^
0_0_19789039_19380.cpp:28:24: error: 'endl' was not declared in this scope
          cout<<min*10<<endl; 
                        ^