Programming Interview Questions
Below programs written in Java but you can use your favorite programming language drive the results.Scenario #1:
You are given a linked list with nodes containing characters. The number of characters in each node might differ
Question: Check if the data stored in the linked list is a palindrome?
import java.util.*;
public class LList {
public boolean isPal(List<String> ll){
String forward = "";
String bacward = "";
for (int i=0; i < ll.size();i++)
{
forward = forward + ll.get(i);
bacward = bacward + reverse(ll.get(ll.size()-1-i));
}
System.out.println("Forward:"+forward);
System.out.println("Backward:"+bacward);
if (forward.equalsIgnoreCase(bacward)){
return true;
}
return false;
}
public String reverse(String ss){
String rev="";
for (int i=(ss.length()-1); i >= 0 ; i--){
rev = rev + ss.charAt(i);
}
return rev;
}
public static void main(String args[]){
List<String> ll = new LinkedList<String>();
ll.add("su");
ll.add("n");
ll.add("us");
LList l = new LList();
System.out.println("List is:"+ ll);
System.out.println("Is palindrome:"+ l.isPal(ll));
}
}
Result is:
List is:[su, n, us]
Forward:sunus
Backward:sunus
Is palindrome:true
Scenario #2:
Reverse the given string as well as reverse individual word in a sentence.
import java.util.*;
public class StringRev {
public String reverseString(String s) {
if (s.length() <= 1) {
return s;
}
return reverseString(s.substring(1,s.length())) + s.charAt(0);
}
public static void main(String args[]){
String str ="I love India";
System.out.println("Given string is:"+ str);
String word = "";
List<String> ll = new LinkedList<String>();
StringRev sr = new StringRev();
System.out.println("Entire string reverse:"+sr.reverseString(str));
for (int i=0; i< str.length();i++){
if (str.charAt(i)!=' '){
word = word + str.charAt(i);
} else{
ll.add(word);
word = "";
}
if (i == str.length()-1){
ll.add(word);
}
}
String backward = "";
for (int i=0; i < ll.size();i++){
backward = backward +' ' +sr.reverseString(ll.get(i));
}
System.out.println("Individual word string reverse:"+backward);
}
}
Output is:
Given string is:I love India
Entire string reverse:aidnI evol I
Individual word string reverse: I evol aidnI
