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find all different android lock screen combinations with length of 5 in a n*
n array.
The conditions are 1) just like drawing on the n*n array, once you put down
your pencil you cannot poll it up to select next number; 2) all the 5
numbers should be different; 3) the path can overlap when you go to the
other direction; 4) cannot jump over number, the next number is adjacent to
previous number, but may not be the last selected number due to overlapping
path.
求解题思路，谢谢！
n array.
The conditions are 1) just like drawing on the n*n array, once you put down
your pencil you cannot poll it up to select next number; 2) all the 5
numbers should be different; 3) the path can overlap when you go to the
other direction; 4) cannot jump over number, the next number is adjacent to
previous number, but may not be the last selected number due to overlapping
path.
求解题思路，谢谢！
