View Compilation Error

0_0_31278581_11473.cpp: In function 'int main()':
0_0_31278581_11473.cpp:17:7: error: 'cin' was not declared in this scope
 while(cin>>n)
       ^
0_0_31278581_11473.cpp:20:1: error: 'cout' was not declared in this scope
 cout<<m<<' '<<n<<' '<<2*a[n]<<endl;
 ^
0_0_31278581_11473.cpp:20:31: error: 'endl' was not declared in this scope
 cout<<m<<' '<<n<<' '<<2*a[n]<<endl;
                               ^