foo.cc: In function 'int main()':
foo.cc:6:2: error: 'cin' was not declared in this scope
    6 |  cin>>n>>m;
      |  ^~~
foo.cc:2:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
    1 | #include<cstdio>
  +++ |+#include <iostream>
    2 | using namespace std;
foo.cc:14:3: error: 'cout' was not declared in this scope
   14 |   cout<<a[i][j]+b[i][j]<<" ";
      |   ^~~~
foo.cc:14:3: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
foo.cc:15:3: error: 'cout' was not declared in this scope
   15 |   cout<<endl;
      |   ^~~~
foo.cc:15:3: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
foo.cc:15:9: error: 'endl' was not declared in this scope
   15 |   cout<<endl;
      |         ^~~~
foo.cc:2:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
    1 | #include<cstdio>
  +++ |+#include <ostream>
    2 | using namespace std;

[Hydro](https://hydro.ac)提供评测服务