/in/foo.cc:1:30: warning: extra tokens at end of #include directive
 #include<bits/stdc++.h>using namespace std;long long a, b;cin>>a>>b;int main(){char c;cin>>c;if(c=='+')cout<<a+b<<endl;if(c=='-')cout <<a-b<<endl;if (c=='*')cout<<a*b<<endl;if (c=='/')cout<<a/b<<endl;}
                              ^~~~~~~~~
/in/foo.cc:1:202: fatal error: bits/stdc++.h>usin: No such file or directory
 #include<bits/stdc++.h>using namespace std;long long a, b;cin>>a>>b;int main(){char c;cin>>c;if(c=='+')cout<<a+b<<endl;if(c=='-')cout <<a-b<<endl;if (c=='*')cout<<a*b<<endl;if (c=='/')cout<<a/b<<endl;}
                                                                                                                                                                                                          ^
compilation terminated.