NAB Innovation Center India Senior Analyst Interview Questions and Answers

There is two rounds of coding test one is offline and another is online
offline has 3 coding test it was easy
online has 1 machine java coding test it was little bit tough i able to pass with 100% uses cases

This came
There is a board made of two rows and N columns. The board is represented by two strings, rowl and row2, made of characters 'R', 'W' and/or '?'. A board is balanced if, in each row and in each column, the number of characters 'R' is equal to the number of characters 'w'. For example, the following board is balanced:
?RW?WR ?WR?RW
and the following board is not balanced:
W?WR? R??W?
(there are two characters 'w' and one character 'R' in the first row).
The question marks ('?') can be replaced with 'w' or 'R'. What is the minimum number of replacements needed to balance the board?
Write a function:
class Solution { public int solution (String row1, String row2);
}
that, given two strings row1 and row2 made of N characters each, returns the minimum number of replacements needed to balance the board. If it is not possible to balance the board, the function should return -1.
Examples:
1. For row1 = "W?WR?" and row2 = "R??W?", the board initially looks as follows:
W?WR?
R??W?
The last question mark in the first row and the second question mark in the second row
can be replaced with 'R'. The last question mark in the second row can be replaced with 'w'. After these replacements, the board is balanced and looks as follows:
W?WRR R?RWW
The function should return 3.
2. For row1 = "R?R??" and row2 = "??W??", five replacements are needed to balance the board:
R?RWW W?WRR
The function should return 5.
3. For row1 = "RR?" and row2 = "?R?", it is not possible to balance the board. The function should return -1.
4. For row1 = "www??" and row2 = "RRR??", it is not possible to balance the board. The function should return -1.
5. For row1 = "?RW?WR" and row2 = "?WR?RW", the board is already balanced. The function should return 0.
Write an efficient algorithm for the following assumptions:
⚫ row1 and row2 are made only of the characters 'W', 'R' and/or '?'";
⚫ row1 and row2 have the same length, equal to N;
• N is an integer within the range [1..100,000].

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