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HIIT Open 2018
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CSES - HIIT Open 2018 - Find a WordCSES - Find a Word
Find a Word
|Time limit:||1.00 s|
|Memory limit:||512 MB|
There is an $n \times n$ grid whose each square contains a character between A and Z. You can create a word by starting at the upper-left square and moving one step right or down on each step until you reach the lower-right square.
If you create a list of all such words and sort them lexicographically, what is the $k$th word in the list?
The first input line has two integers $n$ and $k$: the size of the grid and the parameter $k$.
After this, there are $n$ lines that describe the grid. Each line consists of $n$ characters between A and Z.
Print the requested word. You can assume that such a word exists.
Explanation: The list is [