SDE - Intern

For a given integer array/list 'ARR' of size 'N' containing all distinct values, find the total number of 'Inversions' that may exist.

An inversion is defined for a pair of integers in the array/list when the following two conditions are met.

A pair ('ARR[i]', 'ARR[j]') is said to be an inversion when:

1. 'ARR[i] > 'ARR[j]' 
2. 'i' < 'j'

Where 'i' and 'j' denote the indices ranging from [0, 'N').

You are given a string 'str' of length 'N'.

Your task is to return the longest palindromic substring. If there are multiple strings, return any.

A substring is a contiguous segment of a string.

For example :

str = "ababc"

The longest palindromic substring of "ababc" is "aba", since "aba" is a palindrome and it is the longest substring of length 3 which is a palindrome. 

There is another palindromic substring of length 3 is "bab". Since starting index of "aba" is less than "bab", so "aba" is the answer.

You are given a list of strings, ‘DICTIONARY[]’ that represents the correct spelling of words and a query string ‘QUERY’ that may have incorrect spelling. You have to check whether the spelling of the string ‘QUERY’ is correct or not. If not, then return the list of suggestions from the list ‘DICTIONARY’. Otherwise, return an empty list which will be internally interpreted as the correct string.

Note:

1) The suggested correct strings for the string  ‘QUERY’ will be all those strings present in the ‘DICTIONARY[]’ that have the prefix same as the longest prefix of string ‘QUERY’.

2) The ‘DICTIONARY[]’ contains only distinct strings.

For example:

Given 'DICTIONARY[]' = {“ninja”, “ninjas”, “nineteen”, “ninny”} and query = “ninjk”. Since “ninjk” is not present in the ‘DICTIONARY[]’, it is an incorrect string. The suggested current spellings for “ninjk” are “ninja” and “ninjas”. It is because “ninj” is the longest prefix of “ninjk” which is present as the prefix in ‘DICTIONARY’.

You are given two binary trees with 'n' and 'm' nodes respectively.

You need to return true if the two trees are identical. Otherwise, return false.

Example:

For the trees given below:- 

The given trees are identical as:-
1. The number of nodes in both trees is the same. 
2. The number of edges in both trees is the same. 
3. The data for root for both the trees is the same i.e 5. 
4. The data of root -> left (root’s left child) for both the trees is the same i.e 2.
5. The data of root -> right (root’s right child) for both the trees is the same i.e 3.
6. The data of root -> right -> left ( left child of root’s right child) for both the trees is the same i.e 6.
7. Nodes with data 2 and 6 are the leaf nodes for both the binary trees. 

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