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View Compilation Error

0_0_32680464_11711.cpp: In function 'int main()':
0_0_32680464_11711.cpp:8:8: error: 'cin' was not declared in this scope
  while(cin>>n){
        ^
0_0_32680464_11711.cpp:19:4: error: 'cout' was not declared in this scope
    cout<<cnt<<endl;   
    ^
0_0_32680464_11711.cpp:19:15: error: 'endl' was not declared in this scope
    cout<<cnt<<endl;   
               ^


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