51.
What is the time complexity of the following code used to find the length of the string?
#include<stdio.h>
int get_len(char *s)
{
      int len = 0;
      while(s[len] != '\0')
        len++;
      return len;
}
int main()
{
      char *s = "lengthofstring";
      int len = get_len(s);
      printf("%d",len);
      return 0;
}

56.
What is the rule for encryption in playfair cipher if the letters in a pair does not appear in same row or column?

59.
Which of the following statement is not true regarding columnar transposition cipher?

60.
What is the time complexity of the recursive implementation used to find the largest and smallest element in a linked list?
#include<stdio.h>
#include<stdlib.h>
struct Node
{
     int val;
     struct Node* next;
}*head;
int max_of_two(int a, int b)
{
      if(a > b)
        return a;
      return b;
}
int recursive_get_max(struct Node* temp)
{
      if(temp->next == 0)
        return  temp->val;
      return max_of_two(temp->val,recursive_get_max(temp->next));
}
int min_of_two(int a, int b)
{
      if(a < b)
        return a;
      return b;
}
int recursive_get_min(struct Node* temp)
{
      if(temp->next == 0)
        return  temp->val;
      return min_of_two(temp->val,recursive_get_min(temp->next));
}
int main()
{
     int n = 9, arr[9] ={1,3,2,4,5,0,5,6,7},i;
     struct Node *temp, *newNode;
     head = (struct Node*)malloc(sizeof(struct Node));
     head -> next =0;
     temp = head;
     for(i=0;i<n;i++)
     {
           newNode =(struct Node*)malloc(sizeof(struct Node));
           newNode->next = 0;
           newNode->val = arr[i];
           temp->next =newNode;
           temp = temp->next;
     }
     int max_num = recursive_get_max(head->next);
     int min_num = recursive_get_min(head->next);
     printf("%d %d",max_num,min_num);
     return 0;
}