View Compilation Error

0_0_29942489_30634.cpp: In function 'int main()':
0_0_29942489_30634.cpp:17:5: error: 'cin' was not declared in this scope
     cin>>t;
     ^
0_0_29942489_30634.cpp:20:35: error: 'memset' was not declared in this scope
         memset(vis, 0, sizeof(vis));
                                   ^
0_0_29942489_30634.cpp:68:9: error: 'cout' was not declared in this scope
         cout<<"Case "<<p<<": ";
         ^
0_0_29942489_30634.cpp:71:26: error: 'endl' was not declared in this scope
             cout<<"YES"<<endl;
                          ^
0_0_29942489_30634.cpp:80:25: error: 'endl' was not declared in this scope
             cout<<"NO"<<endl;
                         ^