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Probability Of Knight In The Chessboard

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1. You are given a N*N chessboard and the starting position of the knight in the chessboard.
2. The rows and columns are 0 indexed, so the top-left square is (0, 0), and the bottom-right square is (N-1, N-1).
3. You have to find the probability of knight to remain in the chessboard after exactly k number of moves.

Note -> The knight continues moving until it has made exactly K moves or has moved off the chessboard.
Input Format 
A number N
A number K
Two numbers r and c(starting row and column position of knight in the chessboard).
Output Format 
Check the sample output and question video.
Question Video
Constraints 
1 <= N <= 25
0 <= K <= 100
0 <= r,c <= N-1
Sample Input 
3
2
0
0
Sample Output 
0.0625


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