Software Developer

You are given a paragraph that may have letters both in lowercase and uppercase, spaces, and punctuation. You have also given a list of banned words. Now your task is to find the most frequent word which is not in the list of banned words. There will always be a solution, and the solution will be unique.

While comparing words, you can ignore whether the letter is lowercase or uppercase. For example, ‘AsK’ and ‘aSK’ are the same. The words will always contain only alphabets or we can say words will be separated by spaces or punctuation. The answer will be in uppercase letters.

The words in the banned list will always be in upper letters and free from punctuation and spaces.

For example :

Paragraph = ‘It's a square SqUare. It's a FLAT flat.’ 
Banned =[FLAT, IT, S]. 
So we can see these words [IT, S, SQUARE, FLAT ]  are most frequent.
Now we will look at to banned list and we can see 3 of the words are banned.
So we have a unique answer SQUARE which has a frequency of 2 and not on the banned list.

You are given a pattern in the form of a string and a collection of words. Your task is to determine if the pattern string and the collection of words have the same order.

Note :

The strings are non-empty.

The strings only contain lowercase English letters.

You are given an integer array 'ARR' of size 'N' and an integer 'S'. Your task is to return the list of all pairs of elements such that each sum of elements of each pair equals 'S'.

Note:

Each pair should be sorted i.e the first value should be less than or equals to the second value. 

Return the list of pairs sorted in non-decreasing order of their first value. In case if two pairs have the same first value, the pair with a smaller second value should come first.

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