View Compilation Error

0_0_21597026_18584.cpp: In function 'int main()':
0_0_21597026_18584.cpp:47:12: error: 'cin' was not declared in this scope
     while (cin>>n>>m>>t&&n&&m&&t) {
            ^
0_0_21597026_18584.cpp:49:37: error: 'memset' was not declared in this scope
         memset(book, 0, sizeof(book));
                                     ^
0_0_21597026_18584.cpp:64:18: error: 'cout' was not declared in this scope
         if(!flag)cout<<"NO"<<endl;
                  ^
0_0_21597026_18584.cpp:64:30: error: 'endl' was not declared in this scope
         if(!flag)cout<<"NO"<<endl;
                              ^
0_0_21597026_18584.cpp:65:14: error: 'cout' was not declared in this scope
         else cout<<"YES"<<endl;
              ^
0_0_21597026_18584.cpp:65:27: error: 'endl' was not declared in this scope
         else cout<<"YES"<<endl;
                           ^