/in/foo.cc: In function 'int main()':
/in/foo.cc:21:6: error: 'i' was not declared in this scope
  for(i = 0; i < edge; i++)
      ^
/in/foo.cc:26:6: error: 'i' was not declared in this scope
  for(i = 0; i < edge; i++)
      ^
/in/foo.cc:28:2: error: 'i' was not declared in this scope
  i =0;
  ^
/in/foo.cc:46:11: warning: unused variable 'y' [-Wunused-variable]
       int y = r[k].b-1;
           ^
/in/foo.cc:70:3: error: 'j' was not declared in this scope
   j = 0;
   ^