View Compilation Error

0_0_26939420_22590.cpp: In function 'int main()':
0_0_26939420_22590.cpp:19:2: error: 'cin' was not declared in this scope
  cin>>t;
  ^
0_0_26939420_22590.cpp:25:8: error: 'str' was not declared in this scope
   cin>>str;
        ^
0_0_26939420_22590.cpp:45:5: error: 's' was not declared in this scope
     s[m++] = mm;
     ^
0_0_26939420_22590.cpp:61:15: error: 's' was not declared in this scope
    ss = sum - s[i] * s[i] - s[i-1] * s[i-1];
               ^
0_0_26939420_22590.cpp:87:3: error: 'cout' was not declared in this scope
   cout<<"Case #"<<x<<": "<<mm<<endl;
   ^
0_0_26939420_22590.cpp:87:32: error: 'endl' was not declared in this scope
   cout<<"Case #"<<x<<": "<<mm<<endl;
                                ^