Software Engineer

Assume you initially have an empty array say ‘ARR’.

You need to return the updated array provided that some ‘Q’ number of queries were performed on this array.

The queries are of two types:

1. 1 ‘VAL’, for this type of query, you need to insert the integer 'VAL' to the end of the array.
2. 2 ‘VAL’, for this type of query, you need to take the bitwise XOR of all the elements of the array with 'VAL' i.e each element of the array ‘ARR’ will be updated as ‘ARR[i]’ = ‘ARR[i]’ ^ ‘VAL’ ( ^ denotes the bitwise XOR operation).

Note:

1) Bitwise XOR operation takes two numbers and performs XOR operation on every bit of those two numbers. For example, consider two numbers 2 and 3 their bitwise XOR will be 1. Because the binary representation of 2 is '10' and the binary representation of 3 is '11'. And XOR of '10' and '11' will be '01'(because XOR evaluates to 0 if the corresponding bits are the same in both the operands, otherwise it evaluates to 1), which is equal to 1.

2) The first query will always be a type 1 query.

3) Note that the ith query should be performed on the array obtained after performing (i-1)th query on the array and so on i.e the changes of each query are updated on the original array itself.

Given a text and a wildcard pattern of size N and M respectively, implement a wildcard pattern matching algorithm that finds if the wildcard pattern is matched with the text. The matching should cover the entire text not partial text.

The wildcard pattern can include the characters ‘?’ and ‘*’

 ‘?’ – matches any single character 
 ‘*’ – Matches any sequence of characters(sequence can be of length 0 or more)

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You are given a two-dimensional matrix of integers of dimensions N*M, where each cell represents the number of coins in that cell. Alice and Bob have to collect the maximum number of coins. The followings are the conditions to collect coins:

Alice starts from top left corner, i.e., (0, 0) and should reach left bottom corner, i.e., (N-1, 0). Bob starts from top right corner, i.e., (0, M-1) and should reach bottom right corner, i.e., (N-1, M-1).

From a point (i, j), Alice and Bob can move to (i+1, j+1) or (i+1, j-1) or (i+1, j)

They have to collect all the coins that are present at a cell. If Alice has already collected coins of a cell, then Bob gets no coins if goes through that cell again.

For example :

If the matrix is 
0 2 4 1
4 8 3 7
2 3 6 2
9 7 8 3
1 5 9 4

Then answer is 47. As, Alice will collect coins 0+8+3+9+1 = 21 coins. Bob will collect coins 1+7+6+8+4 = 26 coins. Total coins is 21+26 = 47 coins.

You are given a string 'S'. Your task is to partition 'S' such that every substring of the partition is a palindrome. You need to return all possible palindrome partitioning of 'S'.

Note: A substring is a contiguous segment of a string.

For Example:

For a given string “BaaB”
3 possible palindrome partitioning of the given string are:
{“B”, “a”, “a”, “B”}
{“B”, “aa”, “B”}
{“BaaB”}
Every substring of all the above partitions of “BaaB” is a palindrome.

You are provided with a list of numbers from ‘0’ to (2 * ’N’ - 1). You have to find the minimum number of swaps needed to make every even number ‘E’ (present in the list) adjacent to (‘E’ + 1).

For Example:

List = [3, 0, 2, 1]

We have to make ‘0’ adjacent to ‘1’ and ‘2’ to ‘3’. And, to achieve this we can swap ‘0’ with ‘2’.

New list = [3, 2, 0, 1].

Therefore, the answer (minimum number of swaps) is equal to 1.

Note:

There will be only distinct numbers present in the given list.