View Compilation Error

0_0_38522767_17313.cpp: In function 'int main()':
0_0_38522767_17313.cpp:14:4: error: 'cin' was not declared in this scope
    cin>>w[i]>>v[i];
    ^
0_0_38522767_17313.cpp:15:3: error: 'cin' was not declared in this scope
   cin>>m;
   ^
0_0_38522767_17313.cpp:20:3: error: 'cout' was not declared in this scope
   cout<<f[m]<<endl;
   ^
0_0_38522767_17313.cpp:20:15: error: 'endl' was not declared in this scope
   cout<<f[m]<<endl;
               ^