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Data Structures | Linked List | Question 11

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Consider the function f defined below. 


struct item
  int data;
  struct item * next;
int f(struct item *p)
  return (
          (p == NULL) ||
          (p->next == NULL) ||
          (( p->data <= p->next->data) && f(p->next))

For a given linked list p, the function f returns 1 if and only if (GATE CS 2003)


not all elements in the list have the same data value.


the elements in the list are sorted in non-decreasing order of data value


the elements in the list are sorted in non-increasing order of data value


None of them

Answer: (B)


The function checks if the current element is less than or equal to the next element, and recursively applies the same check to the next element. If the end of the list is reached (i.e., p->next is NULL), or the next element is less than the current element, the function returns 1. Otherwise, it returns 0. Therefore, the function returns 1 only if the linked list is sorted in non-decreasing order.

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Last Updated : 14 Jul, 2019
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