Walmart Interview Experience

Round 1:
It was an online round hosted by Walmart on dare2dare. It consisted of 2 coding questions. The coding question goes like this : 

1: This question is also asked in the onsite 2nd intuit interview of SDE-1.
Exactly one swap

Given a string S containing lowercase English alphabet characters. The task is to calculate the number of distinct strings that can be obtained after performing exactly one swap. 

In one swap,Geek can pick two distinct indexes i and j (i.e 1 < i < j < |S| ) of the string, then swap the characters at the position i and j. 

Example 1:
Input:
S = "geek"
Output:
6
Explanation:
After one swap, there are only 6 distinct strings possible.
(i.e "egek","eegk","geek","geke","gkee" and "keeg")

2: This question is also asked in the Hackwithinfy online round.

Partition the array

Given an array A[] of N integers. The task is to partition the array into four non-empty parts P,Q,R and S. 

Let W,X,Y and Z be the sum of the elements in P,Q,R and S respectively. The absolute difference of the maximum and the minimum among W,X,Y and Z should be smallest. Find the smallest absolute difference of the maximum and the minimum among W,X,Y and Z. 

Example 1:
Input:
N = 5 
A[] = [4,2,2,5,1] 
Output: 4 
Explanation: let partition the array 
P,Q,R,S = [4],[2,2],[5],[1] 
W = 4, X = 4, Y = 5, Z = 1 
Difference = max(W,X,Y,Z) – min(W,X,Y,Z) 
= 5 – 1 = 4

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