|시간 제한||메모리 제한||제출||정답||맞은 사람||정답 비율|
|3 초||256 MB||113||90||64||84.211%|
The great pioneers of group theory and linear algebra want to cooperate and join their theories. In group theory, permutations – also known as bijective functions – play an important role. For a finite set A, a function σ : A → A is called a permutation of A if and only if there is some function ρ : A → A with
σ(ρ(a)) = a and ρ(σ(a)) = a for all a ∈ A.
The other half of the new team – the experts on linear algebra – deal a lot with idempotent functions. They appear as projections when computing shadows in 3D games or as closure operators like the transitive closure, just to name a few examples. A function p : A → A is called idempotent if and only if
p(p(a)) = p(a) for all a ∈ A.
To continue with their joined research, they need your help. The team is interested in non-idempotent permutations of a given finite set A. As a first step, they discovered that the result only depends on the set’s size. For a concrete size 1 ≤ n ≤ 105, they want you to compute the number of permutations on a set of cardinality n that are not idempotent.
The input starts with the number t ≤ 100 of test cases. Then t lines follow, each containing the set’s size 1 ≤ n ≤ 105.
Output one line for every test case containing the number modulo 1 000 000 007 = (109 + 7) of non-idempotent permutations on a set of cardinality n.
3 1 2 2171
0 1 6425