foo.cc: In function 'int main()':
foo.cc:19:2: error: expected initializer before 'double'
   19 |  double s=0;
      |  ^~~~~~
foo.cc:24:9: error: 'n' was not declared in this scope
   24 |    cin>>n[i][j];
      |         ^
foo.cc:25:4: error: 's' was not declared in this scope
   25 |    s+=n[i][j];
      |    ^
foo.cc:28:8: error: 's' was not declared in this scope
   28 |  cout<<s<<" ";
      |        ^

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