C Programming Interview Question :
A strange grid has been recovered from an old book. It has 5 columns and infinite number of rows. The bottom row is considered as the first row. First few rows of the grid are like this:

…………..
…………..
20 22 24 26 28
11 13 15 17 19
10 12 14 16 18
1  3  5  7  9
0  2  4  6  8

The grid grows upwards forever! Your task is to find the integer in i’th column in  j’th row of the grid.

Input Format : There will be two integers r and c separated by a single space.
Constraints
1≤r≤2 * 109
1≤c≤5

Rows are indexed from bottom to top and columns are indexed from left to right.

Output Format : Output the answer in a single line.
Sample Input
6 3
Sample Output
25
Explanation: The number in the 6th row and 3rd column is 25.

 

Solution using C Language :

 

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