Python Developer

Given an integer ‘N’, the task is to find its corresponding Roman numeral.

Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.

Symbol      Value
  I           1
  V           5
  X           10
  L           50
  C           100
  D           500
  M           1000

Example :

2 is written as II in the roman numeral, just two one’s added together. 
12 is written as XII, which is simply X(ten) + II(one+one). 
The number 27 is written as XXVII, which is XX + V + II.

Roman numerals are usually written largest to smallest from left to right. 
However, the numeral for four is not IIII. Instead, the number four is written as IV. Because the one is before the five we subtract it making four.
The same principle applies to the number nine, which is written as IX.

There are six instances where subtraction is used:

I can be placed before V (5) and X (10) to make 4 and 9.
X can be placed before L (50) and C (100) to make 40 and 90.
C can be placed before D (500) and M (1000) to make 400 and 900.

A boy fell off a 30-meter ladder but did not get hurt. Why?

You are given a linked list having ‘n’ nodes and an integer ‘k’.

You have to rotate the linked list to the right by ‘k’ positions .

Example :

Input: linked list = [1 2 3 4] , k = 2

Output: 3 4 1 2

Explanation:
We have to rotate the given linked list to the right 2 times. After rotating it to the right once it becomes 4->1->2->3. After rotating it to the right again, it becomes 3->4->1->2. 

You are given a positive integer 'N'. You have to generate all possible sequences of balanced parentheses using 'N' pairs of parentheses.

A sequence of brackets is called balanced if one can turn it into a valid math expression by adding characters ‘+’ and ‘1’. For example, sequences ‘(())()’, ‘()’ and ‘(()(()))’ are balanced, while ‘)(‘, ‘(()’ and ‘(()))(‘ are not.

For example :

For N = 1, there is only one sequence of balanced parentheses,  ‘()’.

For N = 2, all sequences of balanced parentheses are ‘()()’, ‘(())’.

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