View Compilation Error

0_0_29310708_17800.cpp: In function 'int main()':
0_0_29310708_17800.cpp:31:29: error: 'memset' was not declared in this scope
     memset(ans,0,sizeof(ans));
                             ^
0_0_29310708_17800.cpp:36:5: error: 'cin' was not declared in this scope
     cin>>x;
     ^
0_0_29310708_17800.cpp:78:18: error: 'cout' was not declared in this scope
     if(Count!=1) cout<<endl;
                  ^
0_0_29310708_17800.cpp:78:24: error: 'endl' was not declared in this scope
     if(Count!=1) cout<<endl;
                        ^