View Compilation Error

0_0_20772392_18043.cpp: In function 'int main()':
0_0_20772392_18043.cpp:6:2: error: 'cin' was not declared in this scope
  cin>>n>>m;
  ^
0_0_20772392_18043.cpp:31:2: error: 'cout' was not declared in this scope
  cout<<ans[1];
  ^