/in/foo.cc: In function 'int main()':
/in/foo.cc:27:32: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  scanf("%d %d %d ", &n, &m, &q);
                                ^
/in/foo.cc:28:48: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  rep(i, 0, n - 1) scanf("%d %d ", x + i, y + i);
                                                ^
/in/foo.cc:32:36: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   scanf("%d %d %d ", &xn, &ln, &rn); 
                                    ^