View Compilation Error

0_0_30540305_19069.cpp: In function 'int ask1(int, int)':
0_0_30540305_19069.cpp:26:41: error: 'ask' was not declared in this scope
  if(c[p<<1].num >= k) return ask(p<<1, k);
                                         ^
0_0_30540305_19069.cpp:27:79: error: 'ask' was not declared in this scope
  else if (c[p<<1|1].num >= k - c[p<<1].num) return ask(p<<1|1, k - c[p<<1].num);
                                                                               ^
0_0_30540305_19069.cpp: In function 'int ask2(int, int)':
0_0_30540305_19069.cpp:33:45: error: 'ask' was not declared in this scope
  if(c[p<<1|1].num >= k) return ask(p<<1|1, k);
                                             ^
0_0_30540305_19069.cpp:34:78: error: 'ask' was not declared in this scope
  else if(c[p<<1].num >= k - c[p<<1|1].num) return ask(p<<1, k - c[p<<1|1].num);
                                                                              ^