
Nice Permutation
Python
# codewindow.in # nice permutation # code in python from itertools import permutations as p n=int(input()) if n<4: print(0) else: l=[i for i in range(1,n+1)] s=list(p(l)) res=[] for k in s: rem=[] for j in k: rem.append(j%2) if rem[0]!=rem[1] or rem[-1]!=rem[-2]: continue c=1 for i in range(1,len(rem)-1): if rem[i]==rem[i-1] or rem[i]==rem[i+1]: continue else: c=0 break if c: res.append(k) print(len(res)%((10**9)+7)) #end
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