View Compilation Error

0_0_38037809_21649.cpp: In function 'int main()':
0_0_38037809_21649.cpp:38:2: error: 'ios' has not been declared
  ios::sync_with_stdio(false);
  ^
0_0_38037809_21649.cpp:39:2: error: 'cin' was not declared in this scope
  cin.tie(0);cout.tie(0);
  ^
0_0_38037809_21649.cpp:39:13: error: 'cout' was not declared in this scope
  cin.tie(0);cout.tie(0);
             ^
0_0_38037809_21649.cpp:48:27: error: 'memset' was not declared in this scope
   memset(vis,0,sizeof(vis));
                           ^