/in/foo.cc: In function 'int main()':
/in/foo.cc:35:16: warning: left operand of comma operator has no effect [-Wunused-value]
   for(int k=0;k<n1,k++){
                ^
/in/foo.cc:35:23: error: expected ';' before ')' token
   for(int k=0;k<n1,k++){
                       ^
/in/foo.cc:43:2: error: expected ';' before '}' token
  }
  ^
/in/foo.cc:29:6: warning: unused variable 'n1' [-Wunused-variable]
  int n1;
      ^