71.
What is the output of the following code?
#include<stdio.h>
#include<string.h>
void reverse_string(char *s)
{
     int len = strlen(s);
     int i,j;
     i=0;
     j=len-1;
     while(i < j)
     {
         char tmp = s[i];
         s[i] = s[j];
         s[j] = tmp;
         i++;
         j--;
     }
}
int main()
{
      char s[100] = "rotator";
      char t[100];
      strcpy(t,s);
      reverse_string(s);
      if(strcmp(t,s) == 0)
        printf("Yes");
      else
        printf("No");
      return 0;
}

75.
What will be the time complexity of the brute force approach used to find the articulation points in a given graph?
For every vertex V, do: 
Remove V from the graph  
See if the graph remains connected 
If graph is disconnected, add V to the resultant set  
Add V back to the graph

79.
What is the time complexity of the recursive implementation used to convert a decimal number to its binary equivalent?
#include<stdio.h>
int arr[31], len = 0;
void recursive_dec_to_bin(int n)
{
      if(n == 0 && len == 0)
      {
          arr[len++] = 0;
          return;
      }
      if(n == 0)
         return;
      arr[len++] = n % 2;
      recursive_dec_to_bin(n/2);
}