- 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 kth 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.
- 1 \le n \le 30
3 2 AYB ABT UAY
Explanation: The list is [