/in/foo.cc: In function 'int main()':
/in/foo.cc:15:6: error: 'i' was not declared in this scope
  for(i = 0; i < roadnum+1; i++)
      ^
/in/foo.cc:15:6: note: suggested alternative: 'di'
  for(i = 0; i < roadnum+1; i++)
      ^
      di
/in/foo.cc:23:6: error: 'i' was not declared in this scope
  for(i = 0 ; i < roadnum+1; i++)
      ^
/in/foo.cc:23:6: note: suggested alternative: 'di'
  for(i = 0 ; i < roadnum+1; i++)
      ^
      di