foo.cc: In function 'int main()':
foo.cc:7:2: error: 'cin' was not declared in this scope
    7 |  cin>>n>>m;
      |  ^~~
foo.cc:3:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    2 | #include<algorithm>
  +++ |+#include <iostream>
    3 | using namespace std;
foo.cc:26:2: error: 'cout' was not declared in this scope
   26 |  cout<<n-got;
      |  ^~~~
foo.cc:26:2: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?

[Hydro](https://hydro.ac)提供评测服务