diff options
Diffstat (limited to 'progs/a968.py')
| -rw-r--r-- | progs/a968.py | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/progs/a968.py b/progs/a968.py new file mode 100644 index 0000000..5a0b8f1 --- /dev/null +++ b/progs/a968.py @@ -0,0 +1,11 @@ +def count_ways(n):
+ A = [0] * (n + 1)
+ B = [0] * (n + 1)
+ A[0] = 1
+ A[1] = 0
+ B[0] = 0
+ B[1] = 1
+ for i in range(2, n+1):
+ A[i] = A[i - 2] + 2 * B[i - 1]
+ B[i] = A[i - 1] + B[i - 2]
+ return A[n]
\ No newline at end of file |