Problem J Permutation Counting
Dexter considers a permutation of first N natural numbers good if it doesn't have x and x+1 appearing consecutively, where (1 ≤ x < N) For example, for N=3 , all goodpermutations are:
1. {1, 3, 2}
2.{2, 1, 3}
3.{3, 2, 1}
Input
Input starts with an integer T (≤ 10000 , denoting the number of test cases.Each
case starts with a line containing an integer N (1 ≤ N ≤ 106)
.
Output
For each case, print the case number and the number ofgoodpermutations
modulo1000 000 007
.
Sample Input
Output for Sample Input
3
2
3
5
Case 1: 1
Case 2: 3
Case 3: 53 View Code
1 #include